in reply to parenthesis regex

You're not showing us the code that contains the concatenation that produces the error.

No code from you, no answer from us.

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Re^2: parenthesis regex
by moritz (Cardinal) on Jun 25, 2008 at 17:00 UTC
    You're not showing us the code that contains the concatenation that produces the error.

    First I disagreed, because it says "or string" in the warnings, but then I tested:

    perl -wle 'my $a; $a =~ m/foo/' Use of uninitialized value in pattern match (m//) at -e line 1.

    So matching against an undefined value is a different warning, and you are right, the relevant code wasn't quoted in the original question, presumably.