RESOLVED FIXED258531
[JSC] Improve RegExp Lookbehind Character Class Backtracking 
https://bugs.webkit.org/show_bug.cgi?id=258531
Summary [JSC] Improve RegExp Lookbehind Character Class Backtracking
Michael Saboff
Reported 2023-06-26 14:06:15 PDT
We currently backtrack character classes that may contain non-BMP characters by rematching one less than the prior count. For large strings that need to backtrack a large number of characters, this is quit wasteful. Now that we have methods that can read non-BMP characters either forward or bacckward, we can use these to back up just one character. The same applies to lookaheads.
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Michael Saboff
Comment 1 2023-06-26 14:06:46 PDT
<rdar://111051833>
Michael Saboff
Comment 2 2023-06-26 14:20:04 PDT
Pull request: https://github.com/WebKit/WebKit/pull/15304
EWS
Comment 3 2023-06-28 12:42:08 PDT
Committed 265593@main (8e5b3f5761f0): <https://commits.webkit.org/265593@main> Reviewed commits have been landed. Closing PR #15304 and removing active labels.
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