The not match operator !~ is not appropriate in the context of a substitution so the Perl interpreter gets confused (so will anyone else reading your code). In what fashion do you expect !~ to behave differently than =~ (what you should be using) in the context of substitution?

Perl's payment curve coincides with its learning curve.

In reply to Re: Is there a better way of dealing with !~ and "Useless use of not in void context at" warnings? by GrandFather
in thread Is there a better way of dealing with !~ and "Useless use of not in void context at" warnings? by Plankton

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