Regular Expressions

  1. Flags and Modifiers
    1. Case Sensitivity Control
      1. Case-Insensitive Flag
        1. Locale Considerations
          1. Unicode Case Folding
          2. Matching Scope Modifiers
            1. Global Matching
              1. Single Match Behavior
                1. Match Iteration
                2. Line Handling Modifiers
                  1. Multiline Mode
                    1. Single Line Mode
                      1. Anchor Behavior Changes
                      2. Extended Syntax Modifiers
                        1. Free-Spacing Mode
                          1. Comment Integration
                            1. Whitespace Handling
                            2. Unicode Support Flags
                              1. Unicode Mode
                                1. Character Property Support
                                  1. Encoding Considerations

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                                6. Advanced Pattern Constructs

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                                8. Regular Expression Engines