Hello, I'm attempting to use the following in Kamailio: $(hdr(from){re.subst,/(.*?);(.*)/\1/}) --- however it does not match / replace, with this from header sample: From: <sip:714364XXXX@XX.XX.XX.XX ;pstn-params=808282808882;cpc=unknown>;tag=gK0b53f6d9 However if this is fully pcre compatible, then I am a bit lost as I've checked the results in php, perl, and python produces: From: <sip:714364XXXX@XX.XX.XX.XX (expected result) However, Kamailio does not match / replace / etc using the following: xlog("L_INFO", "Test From Header Regex: $(hdr(from){re.subst,/(.*?);(.*)/\1/})"); Code Samples / Regex Pattern Replacements: PHP: http://codepad.org/CUttQH1r Perl: http://codepad.org/ZfAO4X5v Python: http://codepad.org/T14SYWkZ Any comments / help / etc is always appreciated, look forward to hearing back from you all! Sincerely, Brandon Armstead