I have used perl in pipes a lot for when you need to change something easily using a regular expression.
$ find . -name "*Relevant*.pm" | xargs perl -pi -e 's/something/somethingelse/'
The find name part can be tweaked to suit your needs and the regular expression in the Perl part also.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.