That was a poorly worded Q you responded to. To be clear, it was a muse, rather than write "4 or 8 hex chars" other longer ways. You saw a 2nd interpretation that I had dismissed:
  • Doing bitwize-or: {4|8} = {12}; gives only 1 match-length, which is already doable '{12}'
  • Doing match-length-alternation, insofar as it allows multiple lengths to be given, seems more useful.

    In reply to Re^2: what means this regex? $x = qr/[0-9a-f]{4|8}/ by kidongrok
    in thread what means this regex? $x = qr/[0-9a-f]{4|8}/ by kidongrok

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