JavaScript: Validate whether a given value is RegExp or not

Last update on March 06 2025 11:07:24 (UTC/GMT +8 hours)

JavaScript validation: Exercise-8 with Solution

Validate RegExp

Write a JavaScript function to validate whether a given value is RegExp or not.

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to validate whether a given value RegExp or not.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function is_regexp(value)
        {
       return toString.call(value) === '[object RegExp]';
        }

console.log(is_regexp(/test/));

console.log(is_regexp('bar'));

console.log(is_regexp(72));

Sample Output:

true
false
false

Flowchart:

Live Demo:

See the Pen javascript-validation-exercise-8 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

Write a JavaScript function that checks if a given value is a regular expression using the instanceof operator.
Write a JavaScript function that validates if the value’s constructor is RegExp and returns true for valid regex objects.
Write a JavaScript function that tests whether a provided input has a source property and flags it as a RegExp if so.
Write a JavaScript function that distinguishes between a string representing a regex and an actual RegExp object.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript function to validate whether a given value type is pure json object or not.
Next: Write a JavaScript function to validate whether a given value type is char or not.