Another way I often see it done (in any language): 
  $correct = false;    // until otherwise
  do {
     ... prompt ...
     if (validation check) {
       $correct = true;
       // often 'last' here to end loop
     } 
     say("You have chosen the wrong number")
  } until ($correct)

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In reply to Re: Looking for a loop by Anonymous Monk
in thread Looking for a loop by WisDomSeeKer34

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