By the way, you say you want to find 1-3 matches per line, but the && signs in your regex mean that actually you are only succeeding if all three searches succeed.

If you really want 1, 2 or 3 matches swap these for || signs:

if (($hdata =~/$crit1/i) || ($hdata =~/$crit2/i) || 
    ($hdata =~/$crit3/i)) {
  print "$hdata<br>";
}
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