[Webkit-unassigned] [Bug 210576] Certain regexes with nested groups fail to match

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210576

--- Comment #5 from Ross Kirsling <ross.kirsling at sony.com> ---
Alexey noticed that my shrunken regex in comment 0 succeeds with a `u` flag, but the original regex does not. If we unshrink just a bit, this fails:

  /(?:\w+-)+((\w){5,8})-((\w){5,8}-)*\1/u.test('de-gregory-gregory')

...which may suggest multiple issues at play.


I also kept trying ways to further shrink/restrict the comment 0 regex and noticed that the following fails (with or without `u`):

  /^(?:aa~)+(?:a){2,3}~aa?a?a?$/.test('aa~aa~aaaa')

...so nested groups may not be necessary, but that (?:a){2,3} is really important. It needs to be a quantified group with a lower bound greater than 1 and an upper bound greater than the lower bound. (Presumably the bound restrictions are needed so that it doesn't get automatically simplified?)

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