[SR-Users] subst query

[mahesh b]

Hi ,
     Can someone explain me what is \1 and \3 doing in the subst expression
?

Input        :                    From: <sip:anonymous at 10.211.160.168
>;tag=41008079_nab_FFFF_isp_FFFF_cco_FFFF_igo_FFFF_mgt_78DD
subst('/^From:(.*)10.211.160.168(.*)>(.*)/From:\110.211.160.174>\3/ig');
Output     :                  From: <sip:anonymous at 10.211.160.174
>;tag=41008079_nab_FFFF_isp_FFFF_cco_FFFF_igo_FFFF_mgt_78DD

Regards,
Mahesh.b
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