A regular expression for IP numbers and ranges

JavaScript
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A regular expression for IP numbers and ranges

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Question:

I need a regular expression for IP ranges such as:
192.168.0.0/16
123.45.67.89
I want to use it in JavaScript to validate user input. Do you have some code?

Answer:

Yes, use the code shown below.

var IP_Validator_Regexp='(1\d{0,2}|2(?:[0-4]\d{0,1}|[6789]|5[0-5]?)?|' + 
'[3-9]\d?|0)\.(1\d{0,2}|2(?:[0-4]\d{0,1}|[6789]|5[0-5]?)?|[3-9]\d?|0)' +
'\.(1\d{0,2}|2(?:[0-4]\d{0,1}|[6789]|5[0-5]?)?|[3-9]\d?|0)\.(1\d{0,2}' + 
'|2(?:[0-4]\d{0,1}|[6789]|5[0-5]?)?|[3-9]\d?|0)(\/(?:[012]\d?|3[012]?' +
')){0,1}$';

  // how to use it in Javascript

  var regex =/IP_Validator_Regexp/;
  if (!(regex.test(document.getElementById('user_ip').value))) {
    alert('This is not a valid IP number');
    return;
  }

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