A quick Javascript question

I am using a Javascript forms validations within my PHP script, and I have this code:

  fn: function(field, value, params) {

return /^(http|https|ftp):\/\/(([A-Z0-9][A-Z0-9_-]*)(\.[A-Z0-9][A-Z0-9_-]*)+)(:(\d+))?\/?/i.test(value);

  }

that works fine, to make sure a user types in a valid website URL...

I just want to extend that a bit, so that it filters to disallow SUBdomains,

Thanks...

Moved to the appropriate forum.

I'd trying searching this board, and possibly the web for some help with Regular Expressions.

I kind of like the Regex Coach for such things. One of the other guys posted a site he liked just a couple days ago for the same purpose.

HTH,