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  1. or download this
    $uncompiled_re = '(?i-xsm:turtle|fish)';
mysub($uncomiled_re);

$compiled_re = qr/turtle|fish/i;
mysub($comiled_re);
  2. or download this
    $uncompiled_re = "(?i-xsm:\\w)";
mysub($uncomiled_re);

$compiled_re = qr/\w/i;
mysub($comiled_re);