.net - Regex ? in lookbehind not consuming -

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lookbehind ? not consuming :

regex:

(?i)(?<=\bsubject:?).+$

text:

subject: asdf adsf

match

: asdf adsf

i don't want : included in match

if search on:
subject asdf adsf
matches:
asdf adsf
behavior want
appears treat : optional not consuming

if match on subject:? greedy , includes :

use regex (?i)(?<=\bsubject:?)[^:].*$


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