RegExpValidator does not validate a URL pattern correctly

Question

The URL http://www.ftd.de/rss2 is not valid when I check it against the below RegEx in this (unadventurous) :

Answer 1

nhahtdh's answer made me check this issue again. It didn't solve the problem, but it pointed me in the right direction. I'll use the RegExp from his answer, as the suggestion conversion from \uhhhh to \x{hhhh} is necessary as well.

Edit: solution

The actual problem is that when passing a RegExp as String to a RegExpValidator it has to be double escaped. So the Pattern should look like this if it is loaded from a resources file:

general.urlRegExp=^(?:(?:https?|ftp):\\/\\/)(?:\\S+(?::\\S*)?@)?(?:(?!10(?:\\.\\d{1,3}){3})(?!127(?:\\.\\d{1,3}){3})(?!169\\.254(?:\\.\\d{1,3}){2})(?!192\\.168(?:\\.\\d{1,3}){2})(?!172\\.(?:1[6-9]|2\\d|3[0-1])(?:\\.\\d{1,3}){2})(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z\\x{00a1}-\\x{ffff}0-9]+-?)*[a-z\\x{00a1}-\\x{ffff}0-9]+)(?:\\.(?:[a-z\\x{00a1}-\\x{ffff}0-9]+-?)*[a-z\\x{00a1}-\\x{ffff}0-9]+)*(?:\\.(?:[a-z\\x{00a1}-\\x{ffff}]{2,})))(?::\\d{2,5})?(?:\\/[^\\s]*)?$

Now this can be used directly in the RegExpValidator: