while (<$fh>)

You should always put local($_); before such a loop, because the global variable $_ is set to each line and is not cleaned up in the end.

Update: http://perl.plover.com/local.html has an example of the dangers of this kind of while loop.

In reply to Re^2: Cleaning up a text file with compact regex by betterworld
in thread Cleaning up a text file with compact regex by neversaint

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