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How to check for IP address using regular expression in javascript?

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The task is to validate the IP address of both IPv4 as well as IPv6. Here we are going to use RegExp to solve the problem. 
Approach 1:  

  • RegExp: Which split the IP address on. (dot) and check for each element whether they are valid or not(0-255).

Example 1: This example uses the approach discussed above. 

html




<h1 style="color:green;">
    GeeksforGeeks
</h1>
<p id="GFG_UP"></p>
<button onclick="GFG_Fun()">
    click here
</button>
<p id="GFG_DOWN"></p>
<script>
    var up = document.getElementById('GFG_UP');
    var down = document.getElementById('GFG_DOWN');
    var addr = '172.169.43.1';
    up.innerHTML =
    "Click on the button to validate the IP Address.<br>"
    + addr;
      
    function GFG_Fun() {
        down.innerHTML =
    /^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/.test(addr);
    }
</script>


Output: 

How to check for IP address using regular expression in javascript?

How to check for IP address using regular expression in javascript?

Approach 2:  

  • RegExp: Split the IP address on :(colon) and check for each element whether they are valid or not(0000-ffff).

Example 2: This example using the approach discussed above. 

html




<h1 style="color:green;">
    GeeksforGeeks
</h1>
<p id="GFG_UP"></p>
<button onclick="GFG_Fun()">
    click here
</button>
<p id="GFG_DOWN"></p>
<script>
    var up = document.getElementById('GFG_UP');
    var down = document.getElementById('GFG_DOWN');
    var addr = '2001:0db8:0000:0000:0000:ff00:0042:8329';
    up.innerHTML =
    "Click on the button to validate the IP Address.<br>"
    + addr;
      
    function GFG_Fun() {
        down.innerHTML =
    /^[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}$/.test(addr);
    }
</script>


Output: 

How to check for IP address using regular expression in javascript?

How to check for IP address using regular expression in javascript?



Last Updated : 23 Jan, 2023
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