https://bugs.exim.org/show_bug.cgi?id=2673
--- Comment #5 from Petr Pisar <ppisar@???> ---
Nonetheless you have a typo in the code:
static const char pattern[] =
"^((?<scheme>[^:/?#]+):)?(?<authority>//(((?<userinfo>[^/?#]*)@)?(?<host>[^/?#:]*)(?:(?<port>[^/?#]*))?))?(?<path>[^?#]*)(\?(?<query>[^#]*))?(#(?<fragment>.*))?";
^
You need to escape the backslash because it's a special character in C string:
static const char pattern[] =
"^((?<scheme>[^:/?#]+):)?(?<authority>//(((?<userinfo>[^/?#]*)@)?(?<host>[^/?#:]*)(?:(?<port>[^/?#]*))?))?(?<path>[^?#]*)(\\?(?<query>[^#]*))?(#(?<fragment>.*))?";
Then PCRE parses the expression correctly because it will see (\?( instead of
(?(.
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