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2026-06-14docs(regex): add regex porting rulesnsfisis
Document the conventions for porting PCRE patterns to the regex crate (no PCRE crate, panic on compile failure, dropping performance-only possessive quantifiers, ad-hoc compatibility comments). Apply the rule to Platform::expand_path by rewriting its conditional subpattern as an explicit alternation, which the regex crate can compile. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>