I usually want to be on the safe side so I would use

|<ereg search_in="hdr" header="Refer-To:" regexp=".*User-to-User=([0-9a-fA-F]*)%3bencoding%3dhex.*" assign_to="dummy,user-to-user"/>|


If you are 200% sure there won't ever be another hex string inside the Refer-To value than the one you are interested in and that capital letters would always be used, you may use


|<ereg search_in="hdr" header="Refer-To:" regexp="[0-9A-F]{6,}" assign_to="user-to-user"/>|


Pavel


Dne 19.10.2016 v 10:40 Sakharam Thorat napsal(a):

Hi All,


I have extract 00FA08271007F558071CCB value from below header using regex,


Refer-To: <sip:42...@hrd.com?User-to-User=00FA08271007F558071CCB%3bencoding%3dhex>


What regex i should use ?


Best Regards,
Sakharam Thorat.


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