My understanding is that you want to modify the part of the string between the quotes? One way is to use the e flag in the substitution operator s/// to replace $1 with a modified version, in the following example with an upper case version: 

s/"(.+?)"/'"'.uc $1.'"'/e;

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In reply to Re: Regex: Changing $1 by hdb
in thread Regex: Changing $1 by packetstormer

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