I'm faced with the oft-repeated question of how to match a numeric range of values via a regular expression. All of the answers I've found so far, are of the form 
  (2[0-4]\d|25[0-5]|[01]?\d?\d)

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for the typical 0-255 range. None of the answers I've found have attempted to address the question by using the code execution feature of regex. The problem I can't solve is how to report the result of the match!

The i/o is a little crude on this one-liner, but it shows the idea... 
perl -n -e "print (( $x = $_ =~ m@^(\d+)(?{if ($^N < 255 && $^N > 233)
+ {print  'true '}})$@ ) . '  ' )"

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While the "true" output appears appropriately based on the range given, the regular expression always matches (shown by the 1 in the output).

Is there a way to get the regex to fail in the cases where true is not printed?

In reply to does code help regex match numeric ranges? by AlwaysLearning

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