How to check for IP address using regular expression in javascript?
Last Updated :
23 Jan, 2023
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]?)$/.test(addr);
}
</ script >
|
Output:
How to check for IP address using regular expression in javascript?
Approach 2:
- RegExp: Split the IP address on :(colon) and check for each element whether they are valid or not(0000-ffff).
Example 2: This example using the approach discussed above.
html
< h1 style = "color:green;" >
GeeksforGeeks
</ h1 >
< p id = "GFG_UP" ></ p >
< button onclick = "GFG_Fun()" >
click here
</ button >
< p id = "GFG_DOWN" ></ p >
< script >
var up = document.getElementById('GFG_UP');
var down = document.getElementById('GFG_DOWN');
var addr = '2001:0db8:0000:0000:0000:ff00:0042:8329';
up.innerHTML =
"Click on the button to validate the IP Address.< br >"
+ addr;
function GFG_Fun() {
down.innerHTML =
/^[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}\:[a-fA-F0-9]{1, 4}$/.test(addr);
}
</ script >
|
Output:
How to check for IP address using regular expression in javascript?
Like Article
Suggest improvement
Share your thoughts in the comments
Please Login to comment...