Hi there. I am attempting to test a script that worked without error on my windows box to a Red Hat Linux distro. I get the error 'Use of uninitialized value in pattern match (m//)' on the first line of the if statement from the function below. I've found examples of this error online but fail to see how they apply to my situation. How can I fix this error? Thanks. 

sub isUndefOrWhitespace {
    my $str = '';
    $str = shift;
    
    print "$str\n";
    
    if (!defined $str) {
        return 0;
    }elsif (/^\s*$/) {
        return 0;
    }
    
    return 1;
}

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In reply to Use of uninitialized value in pattern match (m//) by troyhughes

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