text: 
  //
  // Regular Expression for URL validation
  //
  // Author: Diego Perini
  // Updated: 2010/12/05
  // License: MIT
  //
  // Copyright (c) 2010-2013 Diego Perini (http://www.iport.it)
  //
  // Permission is hereby granted, free of charge, to any person
  // obtaining a copy of this software and associated documentation
  // files (the "Software"), to deal in the Software without
  // restriction, including without limitation the rights to use,
  // copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the
  // Software is furnished to do so, subject to the following
  // conditions:
  //
  // The above copyright notice and this permission notice shall be
  // included in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  // OTHER DEALINGS IN THE SOFTWARE.
  //
  // the regular expression composed & commented
  // could be easily tweaked for RFC compliance,
  // it was expressly modified to fit & satisfy
  // these test for an URL shortener:
  //
  //   http://mathiasbynens.be/demo/url-regex
  //
  // Notes on possible differences from a standard/generic validation:
  //
  // - utf-8 char class take in consideration the full Unicode range
  // - TLDs have been made mandatory so single names like "localhost" fails
  // - protocols have been restricted to ftp, http and https only as requested
  //
  // Changes:
  //
  // - IP address dotted notation validation, range: 1.0.0.0 - 223.255.255.255
  //   first and last IP address of each class is considered invalid
  //   (since they are broadcast/network addresses)
  //
  // - Added exclusion of private, reserved and/or local networks ranges
  //
  // - Made starting path slash optional (http://example.com?foo=bar)
  //
  // - Allow a dot (.) at the end of hostnames (http://example.com.)
  //
  // Compressed one-line versions:
  //
  // Javascript version
  //
  // /^(?:(?:https?|ftp):\/\/)(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|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\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,}))\.?)(?::\d{2,5})?(?:[/?#]\S*)?$/i
  //
  // PHP version
  //
  // _^(?:(?:https?|ftp)://)(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\x{00a1}-\x{ffff}0-9]-*)*[a-z\x{00a1}-\x{ffff}0-9]+)(?:\.(?:[a-z\x{00a1}-\x{ffff}0-9]-*)*[a-z\x{00a1}-\x{ffff}0-9]+)*(?:\.(?:[a-z\x{00a1}-\x{ffff}]{2,}))\.?)(?::\d{2,5})?(?:[/?#]\S*)?$_iuS
  //
  var re_weburl = new RegExp(
    "^" +
      // protocol identifier
      "(?:(?:https?|ftp)://)" +
      // user:pass authentication
      "(?:\\S+(?::\\S*)?@)?" +
      "(?:" +
        // IP address exclusion
        // private & local networks
        "(?!(?:10|127)(?:\\.\\d{1,3}){3})" +
        "(?!(?:169\\.254|192\\.168)(?:\\.\\d{1,3}){2})" +
        "(?!172\\.(?:1[6-9]|2\\d|3[0-1])(?:\\.\\d{1,3}){2})" +
        // IP address dotted notation octets
        // excludes loopback network 0.0.0.0
        // excludes reserved space >= 224.0.0.0
        // excludes network & broacast addresses
        // (first & last IP address of each class)
        "(?:[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]))" +
      "|" +
        // host name
        "(?:(?:[a-z\\u00a1-\\uffff0-9]-*)*[a-z\\u00a1-\\uffff0-9]+)" +
        // domain name
        "(?:\\.(?:[a-z\\u00a1-\\uffff0-9]-*)*[a-z\\u00a1-\\uffff0-9]+)*" +
        // TLD identifier
        "(?:\\.(?:[a-z\\u00a1-\\uffff]{2,}))" +
        // TLD may end with dot
        "\\.?" +
      ")" +
      // port number
      "(?::\\d{2,5})?" +
      // resource path
      "(?:[/?#]\\S*)?" +
    "$", "i"
  );
  