Code:
on $&^*:text:/\b(New|Done)\x3A\b/S:*:{
  var %a = $regsubex($1-,/\b(New):\b/g,3\t)
  var %a = $regsubex(%a,/\b(Done):\b/g,4\t)
  echo -mirctbfl normal $iif(#,#,$nick) $+(<,$nick,>) %a
  haltdef
}


Remove the "i" modifier to force case sensitivity, ":" is meaningful in event headers, so escape it as \x3A