Regular Expressions

Erbsland Core includes a regular expression engine with Unicode-aware matching, configurable compatibility features, and diagnostics tools for inspecting compiled programs. These pages describe the supported pattern syntax and the assembler used for advanced diagnostics and testing. For the public C++ interface, see Regular Expression Reference.

• Pattern Syntax
  • Syntax Overview
    • Quoting
    • Special Characters
    • Character Types
    • Character Classes
    • Quantifiers
    • Anchors
    • Alternatives
    • Groups
    • Modes and Flags
    • Unsupported Expressions
  • Quoting
    • Strict Escaping
    • Literal Quoting Escapes
    • Quoting Inside Character Classes
    • Legacy and Compatibility Expressions
  • Special Characters
    • \n
    • \r
    • \t
    • \uhhhh
    • \u{hh…}
    • Legacy and Compatibility Expressions
  • Character Types
    • .
    • \d
    • \D
    • \s
    • \S
    • \w
    • \W
    • \p{category}
    • \P{category}
    • Supported Unicode Categories
    • Legacy and Compatibility Expressions
    • Differences from Common Regex Engines
  • Character Classes
    • […]
    • [^…]
    • Legacy and Compatibility Features
    • Differences from Common Regex Engines
  • Quantifiers
    • Quantifier Flavors
    • Quantifier Overview
    • Optional Quantifiers
    • Repetition Quantifiers
    • One-or-More Quantifiers
    • Counted Quantifiers
    • Open-Ended Counted Quantifiers
    • Possessive Quantifiers
    • Counted Quantifier Limits
    • Legacy and Compatibility Quantifiers
    • Differences from Common Regex Engines
  • Anchors
    • \A
    • \b
    • \B
    • \Z
    • ^
    • $
    • Legacy and Compatibility Anchors
    • Notes and Compatibility
  • Alternatives
    • A|B|C
    • (?:A|B|C)
    • Empty alternatives and empty groups
  • Groups
    • (…)
    • (?<name>…)
    • (?:…)
    • (?>…)
    • Legacy and Compatibility Syntax
    • Differences from Common Regex Engines
  • Modes and Flags
    • Standard Flags
    • Inline Flag Sets
    • Local Flag Overrides
    • Unsupported Standalone Flag Removal
    • Legacy and Compatibility Flags
    • Differences from Other Regex Engines
  • Unsupported Expressions
    • Numeric and Ambiguous Escapes
    • Byte-Oriented and Line-Oriented Escapes
    • Unicode and Text Segmentation
    • Backtracking-Dependent Constructs
    • Control-Flow and State-Based Syntax
    • Parser and Engine Directives
    • Conditional Patterns
    • Empty Groups and Alternatives
    • Summary
• Assembler, Usage and Syntax
  • How to use the Assembler
  • Fundamental Syntax
    • Example Listing
    • Language Elements
  • Registers
  • Operations
    • Overview
    • None
    • Jump
    • Split
    • Match
    • Success
    • Failure
    • Anchor
    • Capture
    • Counter
    • Maximum
    • Minimum
    • Char
    • Sequence
    • Category
    • Class
    • Any
  • Commands
    • Section
    • Groups
    • Data
    • Class