Subject: bug#5393: Patch for lookaround assertion in regexp

From: Mattias Engdegård <[email-masked]>
Date: Thu, 27 Jun 2019 21:17:05 +0200

>That looks pretty cool to me, but there was next to no discussion about this at the time (2009), which is a bit odd... 

Didn't see it until now myself, and it looks useful, but perhaps it's unwise to add features that couldn't easily make it into a DFA-based engine. Positive lookahead maybe, the rest probably not. (The old engine would need to be kept around for backrefs, but those are fairly rare in actual use.)