copilot-swe-agent[bot] bfb7b1d046 Commit 6: Fix POSIX-bracket mis-parses revealed by Commit 5 ...

POSIX bracket expressions ([:name:], [.x.], [=x=]) are only valid nested
inside another character class in std::regex. The three predicates now
additionally require that at position `start` we are inside an outer
character class, approximated by requiring more non-escaped `[` than
non-escaped `]` before `start`. A well-formed POSIX bracket contributes
one `[` and one `]` at/after `start`, so the check is unaffected by
earlier POSIX brackets.

Also stop emitting individual charSetTokens for characters inside a
POSIX bracket (`inAnyPosixBracket` guard), which removes the spurious
`[RegExpCharacterRange] :]-z` on [[:alpha:]-z].

Post-fix, unnested `[:digit:]`, `[:alpha:]`, and `a[🅱️]c` are correctly
parsed as ordinary character classes / literal sequences rather than
`RegExpNamedCharacterProperty`; and the [[:alpha:]-z] range no longer
crosses the POSIX bracket boundary.

Bundle: github/codeql-action codeql-bundle-v2.26.1 (CodeQL CLI 2.26.1).

2026-07-21 12:24:52 +00:00

..

cpp

Commit 6: Fix POSIX-bracket mis-parses revealed by Commit 5

2026-07-21 12:24:52 +00:00