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

JavaScript validation with regular expression: Exercise-18 with Solution

Validate Domain

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

Sample Solution:

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'));

Output:

true
true
false
false
true

Flowchart:

Live Demo:

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

For more Practice: Solve these Related Problems:

• Write a JavaScript function that validates if a given string represents a valid domain name using a regular expression.
• Write a JavaScript function that checks for proper domain components like subdomain, domain, and TLD.
• Write a JavaScript function that normalizes the input string (e.g., converts to lowercase) before domain validation.
• Write a JavaScript function that tests various domain name formats and returns true if the domain is valid.

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