How to use regex in a google search button?

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Thanks Jon
I had found a script in forum from Leo, But This Script take the selected files full name to the browser
But my need is Takes a part of the file name before the first 4 digit set. like
I_ born.in-12-octobor in 1985 not 1988
Here some time the separator can be _ or - or . or space all I need to capture
I_ born.in-12-octobor in 1985 to the browser
That mean 1985 is always a 4 digit number set.

function OnClick(data) {
  data.func.command.ClearFiles();
  var objEnum = new Enumerator(data.func.sourcetab.selected);
  while (!objEnum.atEnd()) {
   var item = objEnum.item().name_stem; objEnum.moveNext();
   var encoded = encodeURIComponent(item);
   var search = encoded.replace(/%/g,"%%");
   data.func.command.RunCommand("http://www.google.com/search?q=" + search);
  }
}

If any body can please edit this script