OpenBSD has incorporated into their native http daemon the pattern matching code from Lua. Here's the manual page: http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man7/patterns.7 People were requesting that OpenBSD httpd support address rewriting, but the author didn't want to use regular expressions because of the history of exploits in regex implementations. Somebody suggested looking at Lua's pattern maching and he was quickly won over. Here was the announcement: https://www.marc.info/?l=openbsd-tech&m=143480475721221&w=2