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The shim carried the PCRE A (anchored) modifier alongside every compiled
pattern so preg_match2 could honour it by searching the sub-slice at the
offset. Only two call sites ever passed such a pattern, and each can cut
that slice itself, so the flag is gone from the cache, ResolvedPattern,
PregPattern and the php_regex! macro, and a pattern still carrying A is
now rejected rather than silently searched unanchored.
StringInput::tokenize and PhpFileCleaner::match search from their cursor
with a `^`-prefixed pattern instead. The rule is written down in
docs/dev/regex-porting.md.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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