Regex implementation that supports lookahead and lookbehind

[yubiuser]

Linking for reference:

RegEx engine improvements

Hey all, last weekend I came around to finish what I started working on a rather long time ago: Extending the RegEx engine. For compatibility reasons (and also for the sake of convenience), we stick with the extended Regular expressions (ERE) as we currently have. All your existing regular expressions will still work. There is also some new stuff: Regex Test mode In order to ease regex development, we added a regex test mode to pihole-FTL which can be invoked like pihole-FTL regex-test double…

Does not contain lookahead and lookbehind but major improvement to the RegEx engine.