Hi, I'm looking at a kamailio config where all substdef have the syntax "!regexp!subst!flags", "!DB_URL!db.example.com <http://db.example.com>!g" but i can't find this syntax in the documentation. It's currently running on a fairly modern 5.x version and as far as i know it has never been on 4.x or older. Does anyone know where this syntax is from and if it's possible/recommended to simply replace it with "/regexp/subst"? *Fredrik* *Dahlgren* | Senior SIP/VoIP Engineer fredrik.dahlgren(a)freespee.com |  LinkedIn <https://www.linkedin.com/company/freespee/> |  Twitter <https://twitter.com/freespee>  __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions * sr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: * https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users