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Capabilities

This parser is built to be complete and dependable across major regex flavors. Validation follows official engine behavior, so if a pattern is accepted here, it aligns with what the target engine expects.

Flavor support​

Full syntax support for:

  • PCRE2
  • PCRE
  • Python
  • ECMAScript / JavaScript
  • Rust
  • Go
  • .NET
  • Java

Syntax coverage​

The parser handles complete flavor syntax, including:

  • Backreferences
  • Subroutine calls
  • Conditional expressions
  • Atomic groups
  • Lookbehinds
  • Named groups
  • Possessive quantifiers
  • Flavor-specific edge cases

Output and metadata​

  • Fully typed AST
  • Typed token stream for syntax highlighting and editor UX
  • Detailed diagnostics with source ranges
  • Error recovery support
  • Token-level metadata
  • Source-map style positional accuracy for editor integrations

Future​

  • Linting or best-practice hints
  • Complexity/risk scoring
  • Catastrophic backtracking detection

These are strong candidates for future releases.