Your first group is matching From: <sip:anonymous@[2008:abcd:1234:2260:208:5dff:fe93:5b6 but it looks like you want it to only match <sip:anonymous@. Try escaping the brackets, the regex engine is interpreting them as a list instead of matching the literal "[]" characters.

subst('/^From:(.*)\[2008:abcd:1234:2260:208:5dff:fe93:5b65\](.*)>(.*)/From:\1[2008:abcd:1234:2260:20c:29ff:fe9a:b9cb]>\3/ig');

 

John Petrini
Platforms Engineer
CoreDial 751 Arbor Way, Hillcrest I, Suite 150 Blue Bell, PA 19422
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On Mon, Jul 2, 2018 at 9:40 AM, mahesh b <mahesh.b.2487@gmail.com> wrote:
Thanks John for the Reply.

So if i understand properly :
group 1 is here  <sip:anonymous@
group 2 is empty
group 3 is  ;tag=41008079_nab_FFFF_isp_FFFF_cco_FFFF_igo_FFFF_mgt_78DD

the previous expression is working for IPv4.


Now for IPv6

Input         :           From: <sip:anonymous@[2008:abcd:1234:2260:208:5dff:fe93:5b65]>;tag=42006C96_nab_FFFF_isp_FFFF_cco_FFFF_igo_FFFF_mgt_8092
subst('/^From:(.*)[2008:abcd:1234:2260:208:5dff:fe93:5b65](.*)>(.*)/From:\1[2008:abcd:1234:2260:20c:29ff:fe9a:b9cb]>\3/ig');
Output      :           From: <sip:anonymous@[2008:abcd:1234:2260:208:5dff:fe93:5b6[2008:abcd:1234:2260:20c:29ff:fe9a:b9cb]>;tag=42006C96_nab_FFFF_isp_FFFF_cco_FFFF_igo_FFFF_mgt_8092    //what is going wrong here?

Here 
group 1 is   <sip:anonymous@
group 2 is empty
group 3 is  ;tag=42006C96_nab_FFFF_isp_FFFF_cco_FFFF_igo_FFFF_mgt_8092

what mistake am i making for IPv6 ? if you see the output.

Regards,
Mahesh.b


On Mon, Jul 2, 2018 at 6:54 PM John Petrini <jpetrini@coredial.com> wrote:
They are references to groups in the regex match. The groups are in parenthesis. Whatever is matched by group 1 and 3 will be included in the substitution.

https://regexr.com/ and https://regex101.com/ are both good sites for building and explaining regexes.
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