https://bugs.exim.org/show_bug.cgi?id=1680
--- Comment #2 from David Gausmann <david.gausmann@???> ---
Hello Philip,
thanks for your response.
First, you are right, the intersection of those regular expression is not
^a\d+b$
I didn't knew that lookahead assertions allow dynamic length expressions (I
still remember a "this is not fixed length" error message from PCRE; see bug
#547 where is written that dynamic lenghts are not allowed, but I think that
ticket only affects lookbehind assertions, so I probably jumbled something).
Your suggestion using lookahead assertions could be a solution, but I would
need to do some stuff before, because the user enters the regular expression
and references like (?1) could exist in both regular expressions, which shall
be intersected.
I will test your suggestion. Thanks for your help!
Kind Regards
David Gausmann
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