I think even many old-timers rarely see this bug. You may want to change your expression to something like length( $path ) && ($msg =~ s/$pat/$replace/mg); because the expression 0 is false but non-empty and potentially meaningful to you.

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In reply to Re^4: s/// with an empty pattern uses the previous pattern of a s/// by diotalevi
in thread s/// with an empty pattern uses the previous pattern of a s/// by ckeith100

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