update readne

README.md

@@ -41,6 +41,7 @@ Below is an overview of its main functionality and usage:
    - Operations include:
      - Inserting text before or after specific content.
      - Replacing old text with new text.
+   - NEW: Regex support (prefix markers with `re:`) for `before_text`, `after_text`, and `old_text` to handle dynamical hashes (e.g. Jellyfin assets)
    - Recursively applies changes to files matching specified patterns in the destination directory.
 
 5. **Error and Warning Tracking**:
@@ -84,13 +85,17 @@ copy_rules:
 modification_rules:
   - file_pattern: "*.js"  # Files to modify (supports regex)
     insert_rules:
-      - after_text: "search text"  # Insert after this text
+      - after_text: "search text"  # Insert after this exact (plain) text
         insert_text: "new content"
-      - before_text: "target"  # Insert before this text
+      - before_text: "target"  # Insert before this exact (plain) text
         insert_text: "new content"
+      - before_text: 're:<link href="main\\.jellyfin\\.[^"]+\\.css[^"]*" rel="stylesheet">'  # Regex variant
+        insert_text: "<script>// injected</script>"
     replace_rules:
-      - old_text: "original"  # Text to replace
+      - old_text: "original"  # Plain substring replacement
         new_text: "replacement"
+      - old_text: 're:<link href="main\\.jellyfin\\.[^"]+\\.css[^"]*" rel="stylesheet">'
+        new_text: 're:<link href="newMain\\.newJellyfin\\.[^"]+\\.css[^"]*" rel="stylesheet">'
 ```
 
 ### Running the Script
@@ -102,3 +107,18 @@ So for example:
 ```bash
 python customize-WebUI.py config.yaml
 ```
+
+### Regex Markers Cheat Sheet
+Prefix any marker with `re:` to interpret it as a Python Regex (DOTALL activ):
+
+Examples:
+```
+before_text: 're:<link href="main\\.jellyfin\\.[^"]+\\.css[^"]*" rel="stylesheet">'
+after_text:  're:data-backdroptype="movie,series,book">'
+old_text:    're:this\\.get\("libraryPageSize",!1\),10\);return 0===t\?0:t\|\|100}'
+```
+
+Notes:
+1. Properly escape backslashes (YAML + Regex!)
+2. The first match will be used (count=1 for replacement/insertion)
+3. Idempotency: The script checks whether the insertion or replacement text already exists to avoid duplicates