For those who might not know PCRE is an implementation of regular expressions and is an acronym for "Perl Compatible Regular Expressions". PCRE adds a lot more features and seems to perform better than its POSIX equivalent.
So the situation is as follows:
- various filters use POSIX regexps
- rewrite uses PCRE
If I decide that one of them is enough, then I'd deprecate POSIX style regexps in filters and wouldn't implement POSIX in rewrite rules. This combination would yield a syslog-ng that would give warnings when POSIX-style regular expressions are in use and in a forthcoming release I'd change the default regexp style to PCRE, and yet another syslog-ng release later, I'd phase out POSIX completely.
If the decision is to keep them both in the long run, it would mean that I'd need to implement POSIX style regexps for rewrite rules as well. This would probably the least intrusive for users, but also a lot more work. Also, this would allow adding other filtering options like globbing or prefix search.
What do you think? Is the addition of modular search algorithms worth it?
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