As for easily turning debugging on and off, here's one way via environment vars:

my $re1 = qr/foo|bar/;
{
    use if $ENV{DEBUG_REGEX}, qw/re Debug EXECUTE/;
    my $re2 = qr/quz|baz/;
    print "xfoox"=~$re1, "ybazy"=~$re2;
}

[download]

gives you run-time debug info on $re2 only when the environment var DEBUG_REGEX is set.

In reply to Re^2: Turning on regexp debugging at runtime by Anonymous Monk
in thread Turning on regexp debugging at runtime by SBECK

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