diff --git a/lib/third_party/imgui/ColorTextEditor/source/TextEditor.cpp b/lib/third_party/imgui/ColorTextEditor/source/TextEditor.cpp
index f41129506..0c0da39df 100644
--- a/lib/third_party/imgui/ColorTextEditor/source/TextEditor.cpp
+++ b/lib/third_party/imgui/ColorTextEditor/source/TextEditor.cpp
@@ -247,6 +247,18 @@ int TextEditor::InsertTextAt(Coordinates & /* inout */ aWhere, const char *aValu
         if (*aValue == '\r') {
             // skip
             ++aValue;
+        } else if (*aValue == '\t') {
+            auto &line = mLines[aWhere.mLine];
+            auto c = GetCharacterColumn(aWhere.mLine, cindex);
+            auto r = c % mTabSize;
+            auto d = mTabSize - r;
+            auto i = d;
+            while (i-- > 0)
+                line.insert(line.begin() + cindex++, Glyph(' ', PaletteIndex::Default));
+
+            cindex += d;
+            aWhere.mColumn += d;
+            aValue++;
         } else if (*aValue == '\n') {
             if (cindex < (int)mLines[aWhere.mLine].size()) {
                 auto &newLine = InsertLine(aWhere.mLine + 1);
diff --git a/plugins/builtin/include/content/views/view_pattern_editor.hpp b/plugins/builtin/include/content/views/view_pattern_editor.hpp
index c7dfeb4d2..29f9497b4 100644
--- a/plugins/builtin/include/content/views/view_pattern_editor.hpp
+++ b/plugins/builtin/include/content/views/view_pattern_editor.hpp
@@ -73,6 +73,8 @@ namespace hex::plugin::builtin {
         }
 
     public:
+        std::string preprocessText(const std::string &code);
+
         struct VirtualFile {
             std::fs::path path;
             std::vector<u8> data;
diff --git a/plugins/builtin/source/content/views/view_pattern_editor.cpp b/plugins/builtin/source/content/views/view_pattern_editor.cpp
index a1e31abf4..006b9c62d 100644
--- a/plugins/builtin/source/content/views/view_pattern_editor.cpp
+++ b/plugins/builtin/source/content/views/view_pattern_editor.cpp
@@ -1662,7 +1662,7 @@ namespace hex::plugin::builtin {
     void ViewPatternEditor::loadPatternFile(const std::fs::path &path, prv::Provider *provider) {
         wolv::io::File file(path, wolv::io::File::Mode::Read);
         if (file.isValid()) {
-            auto code = file.readString();
+            auto code = preprocessText(file.readString());
 
             this->evaluatePattern(code, provider);
             m_textEditor.SetText(code);
@@ -1826,6 +1826,15 @@ namespace hex::plugin::builtin {
         });
     }
 
+    std::string ViewPatternEditor::preprocessText(const std::string &code) {
+        std::string result = wolv::util::replaceStrings(code, "\r\n", "\n");
+        result = wolv::util::replaceStrings(result, "\r", "\n");
+        result = wolv::util::replaceTabsWithSpaces(result, 4);
+        while (result.ends_with('\n'))
+            result.pop_back();
+        return result;
+    }
+
     void ViewPatternEditor::registerEvents() {
         RequestPatternEditorSelectionChange::subscribe(this, [this](u32 line, u32 column) {
             if (line == 0)
@@ -1849,8 +1858,9 @@ namespace hex::plugin::builtin {
         });
 
         RequestSetPatternLanguageCode::subscribe(this, [this](const std::string &code) {
-            m_textEditor.SetText(code);
-            m_sourceCode.set(ImHexApi::Provider::get(), code);
+            const std::string preprocessed = preprocessText(code);
+            m_textEditor.SetText(preprocessed);
+            m_sourceCode.set(ImHexApi::Provider::get(), preprocessed);
             m_hasUnevaluatedChanges = true;
         });
 
@@ -2109,7 +2119,7 @@ namespace hex::plugin::builtin {
             .basePath = "pattern_source_code.hexpat",
             .required = false,
             .load = [this](prv::Provider *provider, const std::fs::path &basePath, const Tar &tar) {
-                const auto sourceCode = tar.readString(basePath);
+                const auto sourceCode = preprocessText(tar.readString(basePath));
 
                 m_sourceCode.set(provider, sourceCode);