regex101: PCRE (Legacy) Match Workspace

Explanation

Pro

Positive Lookbehind(?<=^CN=)

^start of line

CN=the literal text CN= (case sensitive)

\w+any word character, repeated at least once

Non-Capturing Group(?:\s+\w+)*

*repeats the group contents below any number of times:

\s+any whitespace character, repeated at least once

\w+any word character, repeated at least once

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Quick Reference

25 tokens

Regular Expression

(?<=^CN=)\w+(?:\s+\w+)*

New

CN=CTX_APP_Bytemobile_UPM,OU=EEGroups,OU=EEOU,DC=ssa,DC=oam,DC=uk,DC=tmo = CTX_APP_Bytemobile_UPM

CN=OSGRP_IP_Transport,OU=EEGroups,OU=EEOU,DC=ssa,DC=oam,DC=uk,DC=tmo = OSGRP_IP_Transport

CN=Remote Desktop Users,CN=Builtin,DC=ssa,DC=oam,DC=uk,DC=tmo

Substitution

CN=CTX_APP_Bytemobile_UPM,OU=EEGroups,OU=EEOU,DC=ssa,DC=oam,DC=uk,DC=tmo = CTX_APP_Bytemobile_UPM

CN=OSGRP_IP_Transport,OU=EEGroups,OU=EEOU,DC=ssa,DC=oam,DC=uk,DC=tmo = OSGRP_IP_Transport

CN=Remote Desktop Users,CN=Builtin,DC=ssa,DC=oam,DC=uk,DC=tmo