VB dot NET … How is it possible that this string doesn't get any shorter even though it clearly…

VB dot NET … How is it possible that this string doesn’t get any shorter even though it clearly contains the text I am replacing?
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(stackoverflow.com/users/16342210/dinahmoehumm)DinahMoeHumm
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(stackoverflow.com/users/66532/dbasnett)dbasnett
(stackoverflow.com/users/16342210/dinahmoehumm)DinahMoeHumm
(stackoverflow.com/users/66532/dbasnett)dbasnett
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