Merge branch 'dev' of https://github.com/prusa3d/PrusaSlicer into dev

resources/data/hints.ini

@@ -139,7 +139,7 @@ documentation_link= https://help.prusa3d.com/en/article/per-model-settings_1674
 disabled_tags = SLA
 
 [hint:Solid infill threshold area]
-text = Solid infill threshold area\nDid you know that you can make parts of your model with a small cross-section be filled with solid infill automatically? Set the<a>Solid infill threshold area</a>.(Expert mode only.)
+text = Solid infill threshold area\nDid you know that you can make parts of your model with a small cross-section be filled with solid infill automatically? Set the<a>Solid infill threshold area.</a>(Expert mode only.)
 hypertext_type = settings
 hypertext_settings_opt = solid_infill_below_area
 hypertext_settings_type = 1
@@ -197,7 +197,7 @@ documentation_link = https://help.prusa3d.com/en/article/insert-pause-or-custom-
 disabled_tags = SLA
 
 [hint:Configuration snapshots]
-text = Configuration snapshots\nDid you know that roll back to a complete backup of all system and user profiles? You can view and move back and forth between snapshots using the Configuration - <a>Configuration snapshots menu</a>.
+text = Configuration snapshots\nDid you know that you can roll back to a complete backup of all system and user profiles? You can view and move back and forth between snapshots using the Configuration - <a>Configuration snapshots menu</a>.
 documentation_link = https://help.prusa3d.com/en/article/configuration-snapshots_1776
 hypertext_type = menubar
 hypertext_menubar_menu_name = Configuration

src/libslic3r/CMakeLists.txt

@@ -100,6 +100,8 @@ set(SLIC3R_SOURCES
     GCode/ThumbnailData.hpp
     GCode/CoolingBuffer.cpp
     GCode/CoolingBuffer.hpp
+    GCode/FindReplace.cpp
+    GCode/FindReplace.hpp
     GCode/PostProcessor.cpp
     GCode/PostProcessor.hpp
 #    GCode/PressureEqualizer.cpp

src/libslic3r/GCode.cpp

@@ -1099,6 +1099,11 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
     // modifies m_silent_time_estimator_enabled
     DoExport::init_gcode_processor(print.config(), m_processor, m_silent_time_estimator_enabled);
 
+    if (! print.config().gcode_substitutions.values.empty()) {
+        m_find_replace = make_unique<GCodeFindReplace>(print.config());
+        file.set_find_replace(m_find_replace.get());
+    }
+
     // resets analyzer's tracking data
     m_last_height  = 0.f;
     m_last_layer_z = 0.f;
@@ -1560,15 +1565,25 @@ void GCode::process_layers(
         [&cooling_buffer = *this->m_cooling_buffer.get()](GCode::LayerResult in) -> std::string {
             return cooling_buffer.process_layer(std::move(in.gcode), in.layer_id, in.cooling_buffer_flush);
         });
+    const auto find_replace = tbb::make_filter<std::string, std::string>(slic3r_tbb_filtermode::serial_in_order,
+        [&self = *this->m_find_replace.get()](std::string s) -> std::string {
+            return self.process_layer(std::move(s));
+        });
     const auto output = tbb::make_filter<std::string, void>(slic3r_tbb_filtermode::serial_in_order,
         [&output_stream](std::string s) { output_stream.write(s); }
     );
 
     // The pipeline elements are joined using const references, thus no copying is performed.
-    if (m_spiral_vase)
+    output_stream.set_find_replace(nullptr);
+    if (m_spiral_vase && m_find_replace)
+        tbb::parallel_pipeline(12, generator & spiral_vase & cooling & find_replace & output);
+    else if (m_spiral_vase)
         tbb::parallel_pipeline(12, generator & spiral_vase & cooling & output);
+    else if (m_find_replace)
+        tbb::parallel_pipeline(12, generator & cooling & find_replace & output);
     else
         tbb::parallel_pipeline(12, generator & cooling & output);
+    output_stream.set_find_replace(m_find_replace.get());
 }
 
 // Process all layers of a single object instance (sequential mode) with a parallel pipeline:
@@ -1603,15 +1618,25 @@ void GCode::process_layers(
         [&cooling_buffer = *this->m_cooling_buffer.get()](GCode::LayerResult in)->std::string {
             return cooling_buffer.process_layer(std::move(in.gcode), in.layer_id, in.cooling_buffer_flush);
         });
+    const auto find_replace = tbb::make_filter<std::string, std::string>(slic3r_tbb_filtermode::serial_in_order,
+        [&self = *this->m_find_replace.get()](std::string s) -> std::string {
+            return self.process_layer(std::move(s));
+        });
     const auto output = tbb::make_filter<std::string, void>(slic3r_tbb_filtermode::serial_in_order,
         [&output_stream](std::string s) { output_stream.write(s); }
     );
 
     // The pipeline elements are joined using const references, thus no copying is performed.
-    if (m_spiral_vase)
+    output_stream.set_find_replace(nullptr);
+    if (m_spiral_vase && m_find_replace)
+        tbb::parallel_pipeline(12, generator & spiral_vase & cooling & find_replace & output);
+    else if (m_spiral_vase)
         tbb::parallel_pipeline(12, generator & spiral_vase & cooling & output);
+    else if (m_find_replace)
+        tbb::parallel_pipeline(12, generator & cooling & find_replace & output);
     else
         tbb::parallel_pipeline(12, generator & cooling & output);
+    output_stream.set_find_replace(m_find_replace.get());
 }
 
 std::string GCode::placeholder_parser_process(const std::string &name, const std::string &templ, unsigned int current_extruder_id, const DynamicConfig *config_override)
@@ -2824,11 +2849,11 @@ void GCode::GCodeOutputStream::close()
 void GCode::GCodeOutputStream::write(const char *what)
 {
     if (what != nullptr) {
-        const char* gcode = what;
-        // writes string to file
-        fwrite(gcode, 1, ::strlen(gcode), this->f);
         //FIXME don't allocate a string, maybe process a batch of lines?
-        m_processor.process_buffer(std::string(gcode));
+        std::string gcode(m_find_replace ? m_find_replace->process_layer(what) : what);
+        // writes string to file
+        fwrite(gcode.c_str(), 1, gcode.size(), this->f);
+        m_processor.process_buffer(gcode);
     }
 }
 

src/libslic3r/GCode.hpp

@@ -10,6 +10,7 @@
 #include "PrintConfig.hpp"
 #include "GCode/AvoidCrossingPerimeters.hpp"
 #include "GCode/CoolingBuffer.hpp"
+#include "GCode/FindReplace.hpp"
 #include "GCode/SpiralVase.hpp"
 #include "GCode/ToolOrdering.hpp"
 #include "GCode/WipeTower.hpp"
@@ -189,6 +190,11 @@ private:
         GCodeOutputStream(FILE *f, GCodeProcessor &processor) : f(f), m_processor(processor) {}
         ~GCodeOutputStream() { this->close(); }
 
+        // Set a find-replace post-processor to modify the G-code before GCodePostProcessor.
+        // It is being set to null inside process_layers(), because the find-replace process
+        // is being called on a secondary thread to improve performance.
+        void set_find_replace(GCodeFindReplace *find_replace) { m_find_replace = find_replace; }
+
         bool is_open() const { return f; }
         bool is_error() const;
         
@@ -208,8 +214,10 @@ private:
         void write_format(const char* format, ...);
 
     private:
-        FILE *f = nullptr;
-        GCodeProcessor &m_processor;
+        FILE             *f { nullptr };
+        // Find-replace post-processor to be called before GCodePostProcessor.
+        GCodeFindReplace *m_find_replace { nullptr };
+        GCodeProcessor   &m_processor;
     };
     void            _do_export(Print &print, GCodeOutputStream &file, ThumbnailsGeneratorCallback thumbnail_cb);
 
@@ -393,6 +401,7 @@ private:
 
     std::unique_ptr<CoolingBuffer>      m_cooling_buffer;
     std::unique_ptr<SpiralVase>         m_spiral_vase;
+    std::unique_ptr<GCodeFindReplace>   m_find_replace;
 #ifdef HAS_PRESSURE_EQUALIZER
     std::unique_ptr<PressureEqualizer>  m_pressure_equalizer;
 #endif /* HAS_PRESSURE_EQUALIZER */

src/libslic3r/GCode/AvoidCrossingPerimeters.cpp

@@ -439,7 +439,15 @@ static std::vector<TravelPoint> simplify_travel(const AvoidCrossingPerimeters::B
         visitor.pt_current = &current_point;
 
         if (!next.do_not_remove)
-            for (size_t point_idx_2 = point_idx + 1; point_idx_2 < travel.size() && !travel[point_idx_2].do_not_remove; ++point_idx_2) {
+            for (size_t point_idx_2 = point_idx + 1; point_idx_2 < travel.size(); ++point_idx_2) {
+                // Workaround for some issue in MSVC 19.29.30037 32-bit compiler.
+#if defined(_WIN32) && !defined(_WIN64)
+                if (bool volatile do_not_remove = travel[point_idx_2].do_not_remove; do_not_remove)
+                    break;
+#else
+                if (travel[point_idx_2].do_not_remove)
+                    break;
+#endif
                 if (travel[point_idx_2].point == current_point) {
                     next      = travel[point_idx_2];
                     point_idx = point_idx_2;

src/libslic3r/GCode/FindReplace.cpp

@@ -0,0 +1,153 @@
+#include "FindReplace.hpp"
+#include "../Utils.hpp"
+
+#include <cctype> // isalpha
+
+namespace Slic3r {
+
+// Similar to https://npp-user-manual.org/docs/searching/#extended-search-mode
+const void unescape_extended_search_mode(std::string &s)
+{
+    boost::replace_all(s, "\\n", "\n"); // Line Feed control character LF (ASCII 0x0A)
+    boost::replace_all(s, "\\r", "\r"); // Carriage Return control character CR (ASCII 0x0D)
+    boost::replace_all(s, "\\t", "\t"); // TAB control character (ASCII 0x09)
+    boost::replace_all(s, "\\0", "\0x00"); // NUL control character (ASCII 0x00)
+    boost::replace_all(s, "\\\\", "\\"); // Backslash character (ASCII 0x5C)
+
+// Notepad++ also supports:
+// \o: the octal representation of a byte, made of 3 digits in the 0-7 range
+// \d: the decimal representation of a byte, made of 3 digits in the 0-9 range
+// \x: the hexadecimal representation of a byte, made of 2 digits in the 0-9, A-F/a-f range.
+// \u: The hexadecimal representation of a two-byte character, made of 4 digits in the 0-9, A-F/a-f range.
+}
+
+GCodeFindReplace::GCodeFindReplace(const std::vector<std::string> &gcode_substitutions)
+{
+    if ((gcode_substitutions.size() % 3) != 0)
+        throw RuntimeError("Invalid length of gcode_substitutions parameter");
+
+    m_substitutions.reserve(gcode_substitutions.size() / 3);
+    for (size_t i = 0; i < gcode_substitutions.size(); i += 3) {
+        Substitution out;
+        try {
+            out.plain_pattern    = gcode_substitutions[i];
+            out.format           = gcode_substitutions[i + 1];
+            const std::string &params = gcode_substitutions[i + 2];
+            out.regexp           = strchr(params.c_str(), 'r') != nullptr || strchr(params.c_str(), 'R') != nullptr;
+            out.case_insensitive = strchr(params.c_str(), 'i') != nullptr || strchr(params.c_str(), 'I') != nullptr;
+            out.whole_word       = strchr(params.c_str(), 'w') != nullptr || strchr(params.c_str(), 'W') != nullptr;
+            if (out.regexp) {
+                out.regexp_pattern.assign(
+                    out.whole_word ? 
+                        std::string("\\b") + out.plain_pattern + "\\b" :
+                        out.plain_pattern,
+                    (out.case_insensitive ? boost::regex::icase : 0) | boost::regex::optimize);
+            } else {
+                unescape_extended_search_mode(out.plain_pattern);
+                unescape_extended_search_mode(out.format);
+            }
+        } catch (const std::exception &ex) {
+            throw RuntimeError(std::string("Invalid gcode_substitutions parameter, failed to compile regular expression: ") + ex.what());
+        }
+        m_substitutions.emplace_back(std::move(out));
+    }
+}
+
+class ToStringIterator 
+{
+public:
+    using iterator_category     = std::output_iterator_tag;
+    using value_type            = void;
+    using difference_type       = void;
+    using pointer               = void;
+    using reference             = void;
+
+    ToStringIterator(std::string &data) : m_data(&data) {}
+
+    ToStringIterator& operator=(const char val) {
+        size_t needs = m_data->size() + 1;
+        if (m_data->capacity() < needs)
+            m_data->reserve(next_highest_power_of_2(needs));
+        m_data->push_back(val);
+        return *this;
+    }
+
+    ToStringIterator& operator*()     { return *this; }
+    ToStringIterator& operator++()    { return *this; }
+    ToStringIterator  operator++(int) { return *this; }
+
+private:
+    std::string *m_data;
+};
+
+template<typename FindFn>
+static void find_and_replace_whole_word(std::string &inout, const std::string &match, const std::string &replace, FindFn find_fn)
+{
+    if (! match.empty() && inout.size() >= match.size() && match != replace) {
+        std::string out;
+        auto [i, j] = find_fn(inout, 0, match);
+        size_t k = 0;
+        for (; i != std::string::npos; std::tie(i, j) = find_fn(inout, i, match)) {
+            if ((i == 0 || ! std::isalnum(inout[i - 1])) && (j == inout.size() || ! std::isalnum(inout[j]))) {
+                out.reserve(inout.size());
+                out.append(inout, k, i - k);
+                out.append(replace);
+                i = k = j;
+            } else
+                i += match.size();
+        }
+        if (k > 0) {
+            out.append(inout, k, inout.size() - k);
+            inout.swap(out);
+        }
+    }
+}
+
+std::string GCodeFindReplace::process_layer(const std::string &ain)
+{
+    std::string out;
+    const std::string *in = &ain;
+    std::string temp;
+    temp.reserve(in->size());
+
+    for (const Substitution &substitution : m_substitutions) {
+        if (substitution.regexp) {
+            temp.clear();
+            temp.reserve(in->size());
+            boost::regex_replace(ToStringIterator(temp), in->begin(), in->end(),
+                substitution.regexp_pattern, substitution.format, boost::match_default | boost::match_not_dot_newline | boost::match_not_dot_null | boost::format_all);
+            std::swap(out, temp);
+        } else {
+            if (in == &ain)
+                out = ain;
+            // Plain substitution
+            if (substitution.case_insensitive) {
+                if (substitution.whole_word)
+                    find_and_replace_whole_word(out, substitution.plain_pattern, substitution.format,
+                        [](const std::string &str, size_t start_pos, const std::string &match) {
+                            auto begin = str.begin() + start_pos;
+                            boost::iterator_range<std::string::const_iterator> r1(begin, str.end());
+                            boost::iterator_range<std::string::const_iterator> r2(match.begin(), match.end());
+                            auto res = boost::ifind_first(r1, r2);
+                            return res ? std::make_pair(size_t(res.begin() - str.begin()), size_t(res.end() - str.begin())) : std::make_pair(std::string::npos, std::string::npos);
+                        });
+                else
+                    boost::ireplace_all(out, substitution.plain_pattern, substitution.format);
+            } else {
+                if (substitution.whole_word)
+                    find_and_replace_whole_word(out, substitution.plain_pattern, substitution.format,
+                        [](const std::string &str, size_t start_pos, const std::string &match) { 
+                            size_t pos = str.find(match, start_pos);
+                            return std::make_pair(pos, pos + (pos == std::string::npos ? 0 : match.size()));
+                        });
+                else
+                    boost::replace_all(out, substitution.plain_pattern, substitution.format);
+            }
+        }
+        in = &out;
+    }
+
+    return out;
+}
+
+}

src/libslic3r/GCode/FindReplace.hpp

@@ -0,0 +1,33 @@
+#ifndef slic3r_FindReplace_hpp_
+#define slic3r_FindReplace_hpp_
+
+#include "../PrintConfig.hpp"
+
+#include <boost/regex.hpp>
+
+namespace Slic3r {
+
+class GCodeFindReplace {
+public:
+    GCodeFindReplace(const PrintConfig &print_config) : GCodeFindReplace(print_config.gcode_substitutions.values) {}
+    GCodeFindReplace(const std::vector<std::string> &gcode_substitutions);
+
+
+    std::string process_layer(const std::string &gcode);
+    
+private:
+    struct Substitution {
+        std::string     plain_pattern;
+        boost::regex    regexp_pattern;
+        std::string     format;
+
+        bool            regexp { false };
+        bool            case_insensitive { false };
+        bool            whole_word { false };
+    };
+    std::vector<Substitution> m_substitutions;
+};
+
+}
+
+#endif // slic3r_FindReplace_hpp_

src/libslic3r/Preset.cpp

@@ -439,7 +439,7 @@ static std::vector<std::string> s_Preset_print_options {
     "support_material_interface_pattern", "support_material_interface_spacing", "support_material_interface_contact_loops", 
     "support_material_contact_distance", "support_material_bottom_contact_distance",
     "support_material_buildplate_only", "dont_support_bridges", "thick_bridges", "notes", "complete_objects", "extruder_clearance_radius",
-    "extruder_clearance_height", "gcode_comments", "gcode_label_objects", "output_filename_format", "post_process", "perimeter_extruder",
+    "extruder_clearance_height", "gcode_comments", "gcode_label_objects", "output_filename_format", "post_process", "gcode_substitutions", "perimeter_extruder",
     "infill_extruder", "solid_infill_extruder", "support_material_extruder", "support_material_interface_extruder",
     "ooze_prevention", "standby_temperature_delta", "interface_shells", "extrusion_width", "first_layer_extrusion_width",
     "perimeter_extrusion_width", "external_perimeter_extrusion_width", "infill_extrusion_width", "solid_infill_extrusion_width",
@@ -1133,6 +1133,20 @@ void add_correct_opts_to_diff(const std::string &opt_key, t_config_option_keys&
     }
 }
 
+// list of options with vector variable, which is independent from number of extruders
+static const std::vector<std::string> independent_from_extruder_number_options = {
+    "bed_shape",
+    "filament_ramming_parameters",
+    "gcode_substitutions",
+    "compatible_prints",
+    "compatible_printers"
+};
+
+bool PresetCollection::is_independent_from_extruder_number_option(const std::string& opt_key)
+{
+    return std::find(independent_from_extruder_number_options.begin(), independent_from_extruder_number_options.end(), opt_key) != independent_from_extruder_number_options.end();
+}
+
 // Use deep_diff to correct return of changed options, considering individual options for each extruder.
 inline t_config_option_keys deep_diff(const ConfigBase &config_this, const ConfigBase &config_other)
 {
@@ -1142,7 +1156,7 @@ inline t_config_option_keys deep_diff(const ConfigBase &config_this, const Confi
         const ConfigOption *other_opt = config_other.option(opt_key);
         if (this_opt != nullptr && other_opt != nullptr && *this_opt != *other_opt)
         {
-            if (opt_key == "bed_shape" || opt_key == "thumbnails" || opt_key == "compatible_prints" || opt_key == "compatible_printers") {
+            if (PresetCollection::is_independent_from_extruder_number_option(opt_key)) {
                 // Scalar variable, or a vector variable, which is independent from number of extruders,
                 // thus the vector is presented to the user as a single input.
                 diff.emplace_back(opt_key);

src/libslic3r/Preset.hpp

@@ -558,6 +558,7 @@ private:
 public:
     static bool                     is_dirty(const Preset *edited, const Preset *reference);
     static std::vector<std::string> dirty_options(const Preset *edited, const Preset *reference, const bool deep_compare = false);
+    static bool                     is_independent_from_extruder_number_option(const std::string& opt_key);
 private:
     // Type of this PresetCollection: TYPE_PRINT, TYPE_FILAMENT or TYPE_PRINTER.
     Preset::Type            m_type;

src/libslic3r/Print.cpp

@@ -110,6 +110,7 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
         "output_filename_format",
         "perimeter_acceleration",
         "post_process",
+        "gcode_substitutions",
         "printer_notes",
         "retract_before_travel",
         "retract_before_wipe",

src/libslic3r/PrintConfig.cpp

@@ -1357,6 +1357,12 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionBool(0));
 
+    def = this->add("gcode_substitutions", coStrings);
+    def->label = L("G-code substitutions");
+    def->tooltip = L("Find / replace patterns in G-code lines and substitute them.");
+    def->mode = comExpert;
+    def->set_default_value(new ConfigOptionStrings());
+
     def = this->add("high_current_on_filament_swap", coBool);
     def->label = L("High extruder current on filament swap");
     def->tooltip = L("It may be beneficial to increase the extruder motor current during the filament exchange"

src/libslic3r/PrintConfig.hpp

@@ -641,6 +641,12 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionBool,                gcode_comments))
     ((ConfigOptionEnum<GCodeFlavor>,   gcode_flavor))
     ((ConfigOptionBool,                gcode_label_objects))
+    // Triples of strings: "search pattern", "replace with pattern", "attribs"
+    // where "attribs" are one of:
+    //      r - regular expression
+    //      i - case insensitive
+    //      w - whole word
+    ((ConfigOptionStrings,             gcode_substitutions))
     ((ConfigOptionString,              layer_gcode))
     ((ConfigOptionFloat,               max_print_speed))
     ((ConfigOptionFloat,               max_volumetric_speed))

src/slic3r/GUI/GUI.cpp

@@ -143,7 +143,7 @@ void change_opt_value(DynamicPrintConfig& config, const t_config_option_key& opt
 			config.set_key_value(opt_key, new ConfigOptionString(boost::any_cast<std::string>(value)));
 			break;
 		case coStrings:{
-			if (opt_key == "compatible_prints" || opt_key == "compatible_printers") {
+			if (opt_key == "compatible_prints" || opt_key == "compatible_printers" || opt_key == "gcode_substitutions") {
 				config.option<ConfigOptionStrings>(opt_key)->values =
 					boost::any_cast<std::vector<std::string>>(value);
 			}

src/slic3r/GUI/OptionsGroup.cpp

@@ -15,6 +15,7 @@
 #include "libslic3r/Exception.hpp"
 #include "libslic3r/Utils.hpp"
 #include "libslic3r/AppConfig.hpp"
+#include "libslic3r/Preset.hpp"
 #include "I18N.hpp"
 
 namespace Slic3r { namespace GUI {
@@ -596,8 +597,7 @@ void ConfigOptionsGroup::back_to_config_value(const DynamicPrintConfig& config,
 	}
     else if (m_opt_map.find(opt_key) == m_opt_map.end() ||
 		    // This option don't have corresponded field
-		     opt_key == "bed_shape"				|| opt_key == "filament_ramming_parameters" ||
-		     opt_key == "compatible_printers"	|| opt_key == "compatible_prints" ) {
+             PresetCollection::is_independent_from_extruder_number_option(opt_key) ) {
         value = get_config_value(config, opt_key);
         this->change_opt_value(opt_key, value);
         OptionsGroup::on_change_OG(opt_key, value);
@@ -876,7 +876,7 @@ boost::any ConfigOptionsGroup::get_config_value(const DynamicPrintConfig& config
 		ret = from_u8(config.opt_string(opt_key));
 		break;
 	case coStrings:
-		if (opt_key == "compatible_printers" || opt_key == "compatible_prints") {
+		if (opt_key == "compatible_printers" || opt_key == "compatible_prints" || opt_key == "gcode_substitutions") {
 			ret = config.option<ConfigOptionStrings>(opt_key)->values;
 			break;
 		}

src/slic3r/GUI/PrintHostDialogs.cpp

@@ -75,8 +75,9 @@ PrintHostSendDialog::PrintHostSendDialog(const fs::path &path, PrintHostPostUplo
 
     txt_filename->SetValue(recent_path);
     txt_filename->SetFocus();
-    
-    m_valid_suffix = recent_path.substr(recent_path.find_last_of('.'));
+
+    if (size_t extension_start = recent_path.find_last_of('.'); extension_start != std::string::npos)
+        m_valid_suffix = recent_path.substr(extension_start);
     // .gcode suffix control
     auto validate_path = [this](const wxString &path) -> bool {
         if (! path.Lower().EndsWith(m_valid_suffix.Lower())) {

src/slic3r/GUI/Tab.cpp

@@ -479,8 +479,7 @@ void Tab::update_label_colours()
             else
                 color = &m_modified_label_clr;
         }
-        if (opt.first == "bed_shape"            || opt.first == "filament_ramming_parameters" || 
-            opt.first == "compatible_prints"    || opt.first == "compatible_printers"           ) {
+        if (PresetCollection::is_independent_from_extruder_number_option(opt.first)) {
             if (Line* line = get_line(opt.first))
                 line->set_label_colour(color);
             continue;
@@ -521,8 +520,7 @@ void Tab::decorate()
         Field*      field = nullptr;
         bool        option_without_field = false;
 
-        if (opt.first == "bed_shape" || opt.first == "filament_ramming_parameters" ||
-            opt.first == "compatible_prints" || opt.first == "compatible_printers")
+        if(PresetCollection::is_independent_from_extruder_number_option(opt.first))
             option_without_field = true;
 
         if (!option_without_field) {
@@ -812,6 +810,12 @@ void Tab::on_roll_back_value(const bool to_sys /*= true*/)
             if ((m_options_list["filament_ramming_parameters"] & os) == 0)
                 to_sys ? group->back_to_sys_value("filament_ramming_parameters") : group->back_to_initial_value("filament_ramming_parameters");
         }
+        if (group->title == "G-code Substitutions") {
+            if ((m_options_list["gcode_substitutions"] & os) == 0) {
+                to_sys ? group->back_to_sys_value("gcode_substitutions") : group->back_to_initial_value("gcode_substitutions");
+                load_key_value("gcode_substitutions", true/*some value*/, true);
+            }
+        }
         if (group->title == "Profile dependencies") {
             // "compatible_printers" option doesn't exists in Printer Settimgs Tab
             if (m_type != Preset::TYPE_PRINTER && (m_options_list["compatible_printers"] & os) == 0) {
@@ -906,7 +910,7 @@ void Tab::update_visibility()
         page->update_visibility(m_mode, page.get() == m_active_page);
     rebuild_page_tree();
 
-    if (m_type == Preset::TYPE_SLA_PRINT)
+    if (m_type == Preset::TYPE_SLA_PRINT || m_type == Preset::TYPE_PRINT)
         update_description_lines();
 
     Layout();
@@ -1655,6 +1659,18 @@ void TabPrint::build()
         option.opt.height = 5;//50;
         optgroup->append_single_option_line(option);
 
+        optgroup = page->new_optgroup(L("G-code Substitutions"));
+
+        create_line_with_widget(optgroup.get(), "gcode_substitutions", "", [this](wxWindow* parent) {
+            return create_manage_substitution_widget(parent);
+        });
+        line = { "", "" };
+        line.full_width = 1;
+        line.widget = [this](wxWindow* parent) {
+            return create_substitutions_widget(parent);
+        };
+        optgroup->append_line(line);
+
     page = add_options_page(L("Notes"), "note.png");
         optgroup = page->new_optgroup(L("Notes"), 0);
         option = optgroup->get_option("notes");
@@ -1699,12 +1715,20 @@ void TabPrint::update_description_lines()
             from_u8(PresetHints::top_bottom_shell_thickness_explanation(*m_preset_bundle)));
     }
 
-    if (m_active_page && m_active_page->title() == "Output options" && m_post_process_explanation) {
-        m_post_process_explanation->SetText(
-            _L("Post processing scripts shall modify G-code file in place."));
+    if (m_active_page && m_active_page->title() == "Output options") {
+        if (m_post_process_explanation) {
+            m_post_process_explanation->SetText(
+                _L("Post processing scripts shall modify G-code file in place."));
 #ifndef __linux__
-        m_post_process_explanation->SetPathEnd("post-processing-scripts_283913");
+            m_post_process_explanation->SetPathEnd("post-processing-scripts_283913");
 #endif // __linux__
+        }
+        // upadte G-code substitutions from the current configuration
+        {
+            m_subst_manager.update_from_config();
+            if (m_del_all_substitutions_btn)
+                m_del_all_substitutions_btn->Show(!m_subst_manager.is_empty_substitutions());
+        }
     }
 }
 
@@ -3824,6 +3848,244 @@ wxSizer* Tab::compatible_widget_create(wxWindow* parent, PresetDependencies &dep
     return sizer;
 }
 
+// G-code substitutions
+
+void SubstitutionManager::init(DynamicPrintConfig* config, wxWindow* parent, wxFlexGridSizer* grid_sizer)
+{
+    m_config = config;
+    m_parent = parent;
+    m_grid_sizer = grid_sizer;
+    m_em = em_unit(parent);
+}
+
+void SubstitutionManager::create_legend()
+{
+    if (!m_grid_sizer->IsEmpty())
+        return;
+    // name of the first column is empty
+    m_grid_sizer->Add(new wxStaticText(m_parent, wxID_ANY, wxEmptyString));
+    // Legend for another columns
+    for (const std::string col : { L("Plain pattern"), L("Format"), L("Params") }) {
+        auto temp = new wxStaticText(m_parent, wxID_ANY, _(col), wxDefaultPosition, wxDefaultSize, wxST_ELLIPSIZE_MIDDLE);
+        //            temp->SetBackgroundStyle(wxBG_STYLE_PAINT);
+        m_grid_sizer->Add(temp);
+    }
+}
+
+// delete substitution_id from substitutions
+void SubstitutionManager::delete_substitution(int substitution_id)
+{
+    // delete substitution
+    std::vector<std::string>& substitutions = m_config->option<ConfigOptionStrings>("gcode_substitutions")->values;
+    if ((substitutions.size() % 3) != 0)
+        throw RuntimeError("Invalid length of gcode_substitutions parameter");
+
+    if ((substitutions.size() / 3) < substitution_id)
+        throw RuntimeError("Invalid substitution_id  to delete");
+
+    substitutions.erase(std::next(substitutions.begin(), substitution_id * 3), std::next(substitutions.begin(), substitution_id * 3 + 3));
+    call_ui_update();
+
+    // update grid_sizer
+    update_from_config();
+}
+
+// Add substitution line
+void SubstitutionManager::add_substitution(int substitution_id, const std::string& plain_pattern, const std::string& format, const std::string& params)
+{
+    bool call_after_layout = false;
+    
+    if (substitution_id < 0) {
+        if (m_grid_sizer->IsEmpty()) {
+            create_legend();
+            substitution_id = 0;
+        }
+        substitution_id = m_grid_sizer->GetEffectiveRowsCount() - 1;
+
+        // create new substitution
+        // it have to be added toconfig too
+        std::vector<std::string>& substitutions = m_config->option<ConfigOptionStrings>("gcode_substitutions")->values;
+        for (size_t i = 0; i < 3; i ++)
+            substitutions.push_back(std::string());
+
+        call_after_layout = true;
+    }
+
+    auto del_btn = new ScalableButton(m_parent, wxID_ANY, "cross");
+    del_btn->Bind(wxEVT_BUTTON, [substitution_id, this](wxEvent&) {
+        delete_substitution(substitution_id);
+    });
+
+    m_grid_sizer->Add(del_btn, 0, wxRIGHT | wxLEFT, m_em);
+
+    auto add_text_editor = [substitution_id, this](const wxString& value, int opt_pos) {
+        auto editor = new wxTextCtrl(m_parent, wxID_ANY, value, wxDefaultPosition, wxSize(15 * m_em, wxDefaultCoord), wxTE_PROCESS_ENTER
+#ifdef _WIN32
+            | wxBORDER_SIMPLE
+#endif
+        );
+
+        editor->SetFont(wxGetApp().normal_font());
+        wxGetApp().UpdateDarkUI(editor);
+        m_grid_sizer->Add(editor, 0, wxALIGN_CENTER_VERTICAL);
+
+        editor->Bind(wxEVT_TEXT_ENTER, [this, editor, substitution_id, opt_pos](wxEvent& e) {
+#if !defined(__WXGTK__)
+            e.Skip();
+#endif // __WXGTK__
+            edit_substitution(substitution_id, opt_pos, into_u8(editor->GetValue()));
+        });
+
+        editor->Bind(wxEVT_KILL_FOCUS, [this, editor, substitution_id, opt_pos](wxEvent& e) {
+            e.Skip();
+            edit_substitution(substitution_id, opt_pos, into_u8(editor->GetValue()));
+        });
+    };
+
+    add_text_editor(from_u8(plain_pattern), 0);
+    add_text_editor(from_u8(format), 1);
+
+    auto params_sizer = new wxBoxSizer(wxHORIZONTAL);
+    bool regexp              = strchr(params.c_str(), 'r') != nullptr || strchr(params.c_str(), 'R') != nullptr;
+    bool case_insensitive    = strchr(params.c_str(), 'i') != nullptr || strchr(params.c_str(), 'I') != nullptr;
+    bool whole_word          = strchr(params.c_str(), 'w') != nullptr || strchr(params.c_str(), 'W') != nullptr;
+
+    auto chb_regexp = new wxCheckBox(m_parent, wxID_ANY, wxString("Regular expression"));
+    chb_regexp->SetValue(regexp);
+    params_sizer->Add(chb_regexp, 0, wxALIGN_CENTER_VERTICAL | wxRIGHT, m_em);
+
+    auto chb_case_insensitive = new wxCheckBox(m_parent, wxID_ANY, wxString("Case insensitive"));
+    chb_case_insensitive->SetValue(case_insensitive);
+    params_sizer->Add(chb_case_insensitive, 0, wxALIGN_CENTER_VERTICAL | wxRIGHT | wxLEFT, m_em);
+
+    auto chb_whole_word = new wxCheckBox(m_parent, wxID_ANY, wxString("Whole word"));
+    chb_whole_word->SetValue(whole_word);
+    params_sizer->Add(chb_whole_word, 0, wxALIGN_CENTER_VERTICAL | wxRIGHT | wxLEFT, m_em);
+
+    for (wxCheckBox* chb : std::initializer_list<wxCheckBox*>{ chb_regexp, chb_case_insensitive, chb_whole_word }) {
+        chb->SetFont(wxGetApp().normal_font());
+        chb->Bind(wxEVT_CHECKBOX, [this, substitution_id, chb_regexp, chb_case_insensitive, chb_whole_word](wxCommandEvent e) {
+            std::string value = std::string();
+            if (chb_regexp->GetValue())
+                value += "r";
+            if (chb_case_insensitive->GetValue())
+                value += "i";
+            if (chb_whole_word->GetValue())
+                value += "w";
+           edit_substitution(substitution_id, 2, value);
+        });
+    }
+
+    m_grid_sizer->Add(params_sizer);
+
+    if (call_after_layout) {
+        m_parent->GetParent()->Layout();
+        call_ui_update();
+    }
+}
+
+void SubstitutionManager::update_from_config()
+{
+    if (!m_grid_sizer->IsEmpty())
+        m_grid_sizer->Clear(true);
+
+    std::vector<std::string>& subst = m_config->option<ConfigOptionStrings>("gcode_substitutions")->values;
+    if (!subst.empty())
+        create_legend();
+
+    if ((subst.size() % 3) != 0)
+        throw RuntimeError("Invalid length of gcode_substitutions parameter");
+
+    int subst_id = 0;
+    for (size_t i = 0; i < subst.size(); i += 3)
+        add_substitution(subst_id++, subst[i], subst[i + 1], subst[i + 2]);
+
+    m_parent->GetParent()->Layout();
+}
+
+void SubstitutionManager::delete_all()
+{
+    m_config->option<ConfigOptionStrings>("gcode_substitutions")->values.clear(); 
+    call_ui_update();
+
+    if (!m_grid_sizer->IsEmpty())
+        m_grid_sizer->Clear(true);
+
+    m_parent->GetParent()->Layout();
+}
+
+void SubstitutionManager::edit_substitution(int substitution_id, int opt_pos, const std::string& value)
+{
+    std::vector<std::string>& substitutions = m_config->option<ConfigOptionStrings>("gcode_substitutions")->values;
+
+    if ((substitutions.size() % 3) != 0)
+        throw RuntimeError("Invalid length of gcode_substitutions parameter");
+
+    if ((substitutions.size() / 3) != m_grid_sizer->GetEffectiveRowsCount()-1)
+        throw RuntimeError("Invalid compatibility between UI and BE");
+
+    if ((substitutions.size() / 3) < substitution_id)
+        throw RuntimeError("Invalid substitution_id to edit");
+
+    substitutions[substitution_id * 3 + opt_pos] = value;
+
+    call_ui_update();
+}
+
+bool SubstitutionManager::is_empty_substitutions()
+{
+    return m_config->option<ConfigOptionStrings>("gcode_substitutions")->values.empty();
+}
+
+// Return a callback to create a TabPrint widget to edit G-code substitutions
+wxSizer* TabPrint::create_manage_substitution_widget(wxWindow* parent)
+{
+    auto create_btn = [parent](ScalableButton** btn, const wxString& label, const std::string& icon_name) {
+        *btn = new ScalableButton(parent, wxID_ANY, icon_name, " " + label + " ", wxDefaultSize, wxDefaultPosition, wxBU_LEFT | wxBU_EXACTFIT, true);
+        (*btn)->SetFont(wxGetApp().normal_font());
+        (*btn)->SetSize((*btn)->GetBestSize());
+    };
+
+    ScalableButton* add_substitution_btn;
+    create_btn(&add_substitution_btn, _L("Add G-code substitution"), "add_copies");
+    add_substitution_btn->Bind(wxEVT_BUTTON, [this](wxCommandEvent e) {
+        m_subst_manager.add_substitution();
+        m_del_all_substitutions_btn->Show();
+    });
+
+    create_btn(&m_del_all_substitutions_btn, _L("Delete all G-code substitution"), "cross");
+    m_del_all_substitutions_btn->Bind(wxEVT_BUTTON, [this](wxCommandEvent e) {
+        m_subst_manager.delete_all();
+        m_del_all_substitutions_btn->Hide();
+    });
+
+    auto sizer = new wxBoxSizer(wxHORIZONTAL);
+    sizer->Add(add_substitution_btn,        0, wxALIGN_CENTER_VERTICAL | wxRIGHT | wxLEFT, em_unit(parent));
+    sizer->Add(m_del_all_substitutions_btn, 0, wxALIGN_CENTER_VERTICAL | wxRIGHT | wxLEFT, em_unit(parent));
+
+    parent->GetParent()->Layout();
+    return sizer;
+}
+
+// Return a callback to create a TabPrint widget to edit G-code substitutions
+wxSizer* TabPrint::create_substitutions_widget(wxWindow* parent)
+{
+    wxFlexGridSizer* grid_sizer = new wxFlexGridSizer(4, 5, wxGetApp().em_unit()); // delete_button,  "Old val", "New val", "Params"
+    grid_sizer->SetFlexibleDirection(wxHORIZONTAL);
+
+    m_subst_manager.init(m_config, parent, grid_sizer);
+    m_subst_manager.set_cb_edited_substitution([this]() {
+        update_dirty();
+        wxGetApp().mainframe->on_config_changed(m_config); // invalidate print
+    });
+
+    auto sizer = new wxBoxSizer(wxHORIZONTAL);
+    sizer->Add(grid_sizer, 0, wxALIGN_CENTER_VERTICAL);
+
+    parent->GetParent()->Layout();
+    return sizer;
+}
+
 // Return a callback to create a TabPrinter widget to edit bed shape
 wxSizer* TabPrinter::create_bed_shape_widget(wxWindow* parent)
 {

src/slic3r/GUI/Tab.hpp

@@ -43,6 +43,44 @@ namespace GUI {
 class TabPresetComboBox;
 class OG_CustomCtrl;
 
+// G-code substitutions
+
+// Substitution Manager - helper for manipuation of the substitutions
+class SubstitutionManager
+{
+	DynamicPrintConfig* m_config{ nullptr };
+	wxWindow*			m_parent{ nullptr };
+	wxFlexGridSizer*	m_grid_sizer{ nullptr };
+
+	int                 m_em{10};
+	std::function<void()> m_cb_edited_substitution{ nullptr };
+
+public:
+	SubstitutionManager() {};
+	~SubstitutionManager() {};
+
+	void init(DynamicPrintConfig* config, wxWindow* parent, wxFlexGridSizer* grid_sizer);
+	void create_legend();
+	void delete_substitution(int substitution_id);
+	void add_substitution(	int substitution_id = -1,
+							const std::string& plain_pattern = std::string(),
+							const std::string& format = std::string(),
+							const std::string& params = std::string());
+	void update_from_config();
+	void delete_all();
+	void edit_substitution(int substitution_id, 
+						   int opt_pos, // option position insubstitution [0, 2]
+						   const std::string& value);
+	void set_cb_edited_substitution(std::function<void()> cb_edited_substitution) {
+		m_cb_edited_substitution = cb_edited_substitution;
+	}
+	void call_ui_update() {
+		if (m_cb_edited_substitution)
+			m_cb_edited_substitution();
+	}
+	bool is_empty_substitutions();
+};
+
 // Single Tab page containing a{ vsizer } of{ optgroups }
 // package Slic3r::GUI::Tab::Page;
 using ConfigOptionsGroupShp = std::shared_ptr<ConfigOptionsGroup>;
@@ -368,11 +406,15 @@ public:
 	void		update() override;
 	void		clear_pages() override;
 	bool 		supports_printer_technology(const PrinterTechnology tech) const override { return tech == ptFFF; }
+	wxSizer*	create_manage_substitution_widget(wxWindow* parent);
+	wxSizer*	create_substitutions_widget(wxWindow* parent);
 
 private:
 	ogStaticText*	m_recommended_thin_wall_thickness_description_line = nullptr;
 	ogStaticText*	m_top_bottom_shell_thickness_explanation = nullptr;
 	ogStaticText*	m_post_process_explanation = nullptr;
+	ScalableButton* m_del_all_substitutions_btn{nullptr};
+	SubstitutionManager m_subst_manager;
 };
 
 class TabFilament : public Tab

src/slic3r/GUI/UnsavedChangesDialog.cpp

@@ -1156,6 +1156,14 @@ static wxString get_string_value(std::string opt_key, const DynamicPrintConfig&
                 out.RemoveLast(1);
                 return out;
             }
+            if (opt_key == "gcode_substitutions") {
+                if (!strings->empty())
+                    for (size_t id = 0; id < strings->size(); id += 3)
+                        out +=  from_u8(strings->get_at(id))     + ";\t" + 
+                                from_u8(strings->get_at(id + 1)) + ";\t" + 
+                                from_u8(strings->get_at(id + 2)) + ";\n";
+                return out;
+            }
             if (!strings->empty() && opt_idx < strings->values.size())
                 return from_u8(strings->get_at(opt_idx));
         }

tests/fff_print/CMakeLists.txt

@@ -7,6 +7,7 @@ add_executable(${_TEST_NAME}_tests
 	test_fill.cpp
 	test_flow.cpp
 	test_gcode.cpp
+	test_gcodefindreplace.cpp
 	test_gcodewriter.cpp
 	test_model.cpp
 	test_print.cpp

tests/fff_print/test_gcodefindreplace.cpp

@@ -0,0 +1,218 @@
+#include <catch2/catch.hpp>
+
+#include <memory>
+
+#include "libslic3r/GCode/FindReplace.hpp"
+
+using namespace Slic3r;
+
+SCENARIO("Find/Replace with plain text", "[GCodeFindReplace]") {
+    GIVEN("G-code") {
+        const std::string gcode =
+            "G1 Z0; home\n"
+            "G1 Z1; move up\n"
+            "G1 X0 Y1 Z1; perimeter\n"
+            "G1 X13 Y32 Z1; infill\n"
+            "G1 X13 Y32 Z1; wipe\n";
+        WHEN("Replace \"move up\" with \"move down\", case sensitive") {
+            GCodeFindReplace find_replace({ "move up", "move down", "" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G1 X0 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        WHEN("Replace \"move up\" with \"move down\", case insensitive") {
+            GCodeFindReplace find_replace({ "move up", "move down", "i" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G1 X0 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        WHEN("Replace \"move UP\" with \"move down\", case insensitive") {
+            GCodeFindReplace find_replace({ "move UP", "move down", "i" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G1 X0 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        WHEN("Replace \"move up\" with \"move down\", case sensitive") {
+            GCodeFindReplace find_replace({ "move UP", "move down", "" });
+            REQUIRE(find_replace.process_layer(gcode) == gcode);
+        }
+
+        // Whole word
+        WHEN("Replace \"move up\" with \"move down\", whole word") {
+            GCodeFindReplace find_replace({ "move up", "move down", "w" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G1 X0 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        WHEN("Replace \"move u\" with \"move down\", whole word") {
+            GCodeFindReplace find_replace({ "move u", "move down", "w" });
+            REQUIRE(find_replace.process_layer(gcode) == gcode);
+        }
+        WHEN("Replace \"ove up\" with \"move down\", whole word") {
+            GCodeFindReplace find_replace({ "move u", "move down", "w" });
+            REQUIRE(find_replace.process_layer(gcode) == gcode);
+        }
+
+        // Multi-line replace
+        WHEN("Replace \"move up\\nG1 X0 \" with \"move down\\nG0 X1 \"") {
+            GCodeFindReplace find_replace({ "move up\\nG1 X0 ", "move down\\nG0 X1 ", "" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G0 X1 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        // Multi-line replace, whole word.
+        WHEN("Replace \"move up\\nG1 X0\" with \"move down\\nG0 X1\", whole word") {
+            GCodeFindReplace find_replace({ "move up\\nG1 X0", "move down\\nG0 X1", "w" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G0 X1 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        // Multi-line replace, whole word, fails.
+        WHEN("Replace \"move up\\nG1 X\" with \"move down\\nG0 X\", whole word") {
+            GCodeFindReplace find_replace({ "move up\\nG1 X", "move down\\nG0 X", "w" });
+            REQUIRE(find_replace.process_layer(gcode) == gcode);
+        }
+    }
+
+    GIVEN("G-code with decimals") {
+        const std::string gcode =
+            "G1 Z0.123; home\n"
+            "G1 Z1.21; move up\n"
+            "G1 X0 Y.33 Z.431 E1.2; perimeter\n";
+        WHEN("Regular expression NOT processed in non-regex mode") {
+            GCodeFindReplace find_replace({ "( [XYZEF]-?)\\.([0-9]+)", "\\10.\\2", "" });
+            REQUIRE(find_replace.process_layer(gcode) == gcode);
+        }
+    }
+}
+
+SCENARIO("Find/Replace with regexp", "[GCodeFindReplace]") {
+    GIVEN("G-code") {
+        const std::string gcode =
+            "G1 Z0; home\n"
+            "G1 Z1; move up\n"
+            "G1 X0 Y1 Z1; perimeter\n"
+            "G1 X13 Y32 Z1; infill\n"
+            "G1 X13 Y32 Z1; wipe\n";
+        WHEN("Replace \"move up\" with \"move down\", case sensitive") {
+            GCodeFindReplace find_replace({ "move up", "move down", "r" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G1 X0 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        WHEN("Replace \"move up\" with \"move down\", case insensitive") {
+            GCodeFindReplace find_replace({ "move up", "move down", "ri" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G1 X0 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        WHEN("Replace \"move UP\" with \"move down\", case insensitive") {
+            GCodeFindReplace find_replace({ "move UP", "move down", "ri" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G1 X0 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        WHEN("Replace \"move up\" with \"move down\", case sensitive") {
+            GCodeFindReplace find_replace({ "move UP", "move down", "r" });
+            REQUIRE(find_replace.process_layer(gcode) == gcode);
+        }
+
+        // Whole word
+        WHEN("Replace \"move up\" with \"move down\", whole word") {
+            GCodeFindReplace find_replace({ "move up", "move down", "rw" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G1 X0 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        WHEN("Replace \"move u\" with \"move down\", whole word") {
+            GCodeFindReplace find_replace({ "move u", "move down", "rw" });
+            REQUIRE(find_replace.process_layer(gcode) == gcode);
+        }
+        WHEN("Replace \"ove up\" with \"move down\", whole word") {
+            GCodeFindReplace find_replace({ "move u", "move down", "rw" });
+            REQUIRE(find_replace.process_layer(gcode) == gcode);
+        }
+
+        // Multi-line replace
+        WHEN("Replace \"move up\\nG1 X0 \" with \"move down\\nG0 X1 \"") {
+            GCodeFindReplace find_replace({ "move up\\nG1 X0 ", "move down\\nG0 X1 ", "r" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G0 X1 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        // Multi-line replace, whole word.
+        WHEN("Replace \"move up\\nG1 X0\" with \"move down\\nG0 X1\", whole word") {
+            GCodeFindReplace find_replace({ "move up\\nG1 X0", "move down\\nG0 X1", "rw" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0; home\n"
+                // substituted
+                "G1 Z1; move down\n"
+                "G0 X1 Y1 Z1; perimeter\n"
+                "G1 X13 Y32 Z1; infill\n"
+                "G1 X13 Y32 Z1; wipe\n");
+        }
+        // Multi-line replace, whole word, fails.
+        WHEN("Replace \"move up\\nG1 X\" with \"move down\\nG0 X\", whole word") {
+            GCodeFindReplace find_replace({ "move up\\nG1 X", "move down\\nG0 X", "rw" });
+            REQUIRE(find_replace.process_layer(gcode) == gcode);
+        }
+    }
+
+    GIVEN("G-code with decimals") {
+        const std::string gcode =
+            "G1 Z0.123; home\n"
+            "G1 Z1.21; move up\n"
+            "G1 X0 Y.33 Z.431 E1.2; perimeter\n";
+        WHEN("Missing zeros before dot filled in") {
+            GCodeFindReplace find_replace({ "( [XYZEF]-?)\\.([0-9]+)", "\\10.\\2", "r" });
+            REQUIRE(find_replace.process_layer(gcode) ==
+                "G1 Z0.123; home\n"
+                "G1 Z1.21; move up\n"
+                "G1 X0 Y0.33 Z0.431 E1.2; perimeter\n");
+        }
+    }
+}