Regex DSL Status

This tracks the status and progress of built-in result builder DSL APIs. It doesn't necessarily reflect other related API, the protocols used for library extension, or API details beyond result builders such as options and custom character classes.

See https://github.com/apple/swift-experimental-string-processing/issues/63 and https://github.com/apple/swift-experimental-string-processing/issues/132

Current Status

• Concatenation
• Alternation
• Quantification
  • Shorthand operators (.?, .*, .+)
• Conditional
• Backreferences
• Anchors
• Lookaround assertions
• Built-in character classes
• Named subpatterns and subpattern invocations
• Pattern inversions
• Options and option scopes
• Redundantly named captures, branch-reset, etc

Needed

• Conditional patterns
• Pattern inversions
• Options and option scopes
• Redundantly named captures, branch-reset, etc
• Built-in properties
• Balancing groups
• Recursion level for backreferences
• Named captures
• TBD

Type system concerns / impact

TBD

Structural and flat captures

TBD

Start by reviewing the linked issues 63 and 132 alongside the current status checklist. No implementation files, tests, entry points, or concrete definition of done are specified; the open items and type-system sections remain broad or marked TBD.