[pcre-dev] [Bug 2209] Pattern does not match while it should…

https://bugs.exim.org/show_bug.cgi?id=2209

--- Comment #1 from firas <firas.dib@???> ---
Fwiw, I think this could be the optimizer looking for the first non-optional
token and starts matching from there, since "(?<=(a))\1?b" works.

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