So just use capturing parens in your regexp and compare the number to 3. You don't have to do everything in a regexp. 

if( /(\d+\.\d+\.(\d+)\.\d+)/ and $2 > 3 ) {
  print $1, "<br />\n";
}

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In reply to Re: Question about conditional regex capture by Fletch
in thread Question about conditional regex capture by TASdvlper

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