Accord to This thread there is a bug using $regml after using $hfind(name,regex,N,r).
mIRC just return the value of $regml for the last item in the hash table, even if N = 0 :

Code:
alias bugw {
  if ($hget(Ga)) hfree Ga
  var %a 4 ,%b . ; ? /
  while (%a) { hadd -m Ga $+(10,$token(%b,%a,32),10) | dec %a }
  echo -a $hget(Ga,0).item - $hget(Ga,$hget(Ga,0).item).item - $hfind(Ga,/\d(\.|;|\?|\/)\d/,0,r) - $regml(0) - $regml(1)
  echo -a $hget(Ga,0).item - $hget(Ga,$hget(Ga,0).item).item - $hfind(Ga,/\d(\.|;|\?|\/)\d/,1,r) - $regml(0) - $regml(1)
  echo -a $hget(Ga,0).item - $hget(Ga,$hget(Ga,0).item).item - $hfind(Ga,/\d(\.|;|\?|\/)\d/,2,r) - $regml(0) - $regml(1)
  echo -a $hget(Ga,0).item - $hget(Ga,$hget(Ga,0).item).item - $hfind(Ga,/\d(\.|;|\?|\/)\d/,3,r) - $regml(0) - $regml(1)
  echo -a $hget(Ga,0).item - $hget(Ga,$hget(Ga,0).item).item - $hfind(Ga,/\d(\.|;|\?|\/)\d/,4,r) - $regml(0) - $regml(1)
}
$regml(0) and $regml(1) should return 0 and $null if N = 0 because there is no real match

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