JavaScript: Check whether a given value represents a domain or not

Last update on April 24 2023 12:57:57 (UTC/GMT +8 hours)

JavaScript validation with regular expression: Exercise-18 with Solution

Write a JavaScript function to check whether a given value represents a domain.

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Write a JavaScript function to check whether a given value represents a domain or not</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function is_domain(str)
{
 regexp = /^[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,6}$/i;
  
        if (regexp.test(str))
          {
            return true;
          }
        else
          {
            return false;
          }
}

console.log(is_domain('www.example.com'));

console.log(is_domain('www.npm.co.uk'));

console.log(is_domain('http://www.example.com'));

console.log(is_domain('https://www.example.com'));

console.log(is_domain('www.example.com'));

Sample Output:

true
true
false
false
true

Flowchart:

Live Demo:

See the Pen javascript-regexp-exercise-18 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript function to check whether a given value is hexcolor value or not.
Next: Write a JavaScript function to check whether a given value is html or not.