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@UrlValidator(message = "Default message", key = "i18n.key", urlRegexExpression = "${urlRegex}")

urlRegex neither urlRegexExpression are only used on client side to validate URLs - this will be changed with next major release!

If no urlRegex neither urlRegexExpression is defined, default regex will be used instead, based on StackOverflow answer

return "^(https?|ftp):\/\/" +
       "(([a-z0-9$_\\.\\+!\\*\\'\\(\\),;\\?&=-]|%[0-9a-f]{2})+" +
       "(:([a-z0-9$_\\.\\+!\\*\\'\\(\\),;\\?&=-]|%[0-9a-f]{2})+)?" +
       "@)?(#?" +
       ")((([a-z0-9]\\.|[a-z0-9][a-z0-9-]*[a-z0-9]\\.)*" +
       "[a-z][a-z0-9-]*[a-z0-9]" +
       "|((\\d|[1-9]\\d|1\\d{2}|2[0-4][0-9]|25[0-5])\\.){3}" +
       "(\\d|[1-9]\\d|1\\d{2}|2[0-4][0-9]|25[0-5])" +
       ")(:\\d+)?" +
       ")(((\\/+([a-z0-9$_\\.\\+!\\*\\'\\(\\),;:@&=-]|%[0-9a-f]{2})*)*" +
       "(\\?([a-z0-9$_\\.\\+!\\*\\'\\(\\),;:@&=-]|%[0-9a-f]{2})*)" +
       "?)?)?" +
       "(#([a-z0-9$_\\.\\+!\\*\\'\\(\\),;:@&=-]|%[0-9a-f]{2})*)?" +
       "$";