RESOLVED FIXED 272659
Nested duplicate named capturing groups in regex is not syntax error 
https://bugs.webkit.org/show_bug.cgi?id=272659
Summary Nested duplicate named capturing groups in regex is not syntax error
ota-meshi-biz
Reported 2024-04-15 00:05:51 PDT
When I run the following two regexes in Safari's JavaScript console, one gives a syntax error, but the other does not: But I expected both to result in a syntax error. ```js /(?:(?<x>a)|(?<x>b))(?<x>c)/; // not syntax error? /(?<x>c)(?:(?<x>a)|(?<x>b))/; // syntax error ``` I think they should both be syntax errors, since they're just swapped around. What do you think?
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Radar WebKit Bug Importer
Comment 1 2024-04-22 08:54:27 PDT
<rdar://problem/126863735>
Ahmad Saleem
Comment 2 2024-04-22 13:34:22 PDT
It is reproducible in WebKit ToT as well and Chrome Canary 125 and Firefox Nightly 127 both throw 'syntax' error for first one.
Michael Saboff
Comment 3 2024-04-23 01:13:25 PDT
I believe the first one should also be a syntax error. Investigating.
Michael Saboff
Comment 4 2024-04-24 00:34:19 PDT
Testing a fix now.
Michael Saboff
Comment 5 2024-04-24 02:49:19 PDT
Pull request: https://github.com/WebKit/WebKit/pull/27681
EWS
Comment 6 2024-04-24 09:43:26 PDT
Committed 277928@main (93db8886b0d3): <https://commits.webkit.org/277928@main> Reviewed commits have been landed. Closing PR #27681 and removing active labels.
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