https://bugs.exim.org/show_bug.cgi?id=2168
--- Comment #1 from Philip Hazel <ph10@???> ---
I can't do much about this unless you tell me which version of PCRE php 7.1.9
is using. I don't know much about php itself.
A quick test of that pattern with both PCRE1 and PCRE2 gives an "unmatched
parentheses" error. There seem to be 19 opening parens and 20 unquoted closing
parens. How does php handle PCRE compilation errors? How does php handle those
backslashes? If it's like C, then there will be even more unmatched closing
parens handed to PCRE.
Unless I can reproduce the problem in pcretest or pcre2test, I can't set about
trying to fix it.
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