How to check for IP address using regular expression in javascript?
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;"> zambiatek </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]?)$/.test(addr); } </script> |
Output:
How to check for IP address using regular expression in javascript?
Approach 2:
- RegExp: Split the IP address on :(colon) and check for each element whether they are valid or not(0000-ffff).
Example 2: This example using the approach discussed above.
html
<h1 style="color:green;"> zambiatek </h1> <p id="GFG_UP"></p> <button onclick="GFG_Fun()"> click here </button> <p id="GFG_DOWN"></p> <script> var up = document.getElementById('GFG_UP'); var down = document.getElementById('GFG_DOWN'); var addr = '2001:0db8:0000:0000:0000:ff00:0042:8329'; up.innerHTML = "Click on the button to validate the IP Address.<br>" + addr; function GFG_Fun() { down.innerHTML = /^[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}$/.test(addr); } </script> |
Output:
How to check for IP address using regular expression in javascript?
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