w3resource

JavaScript: Check whether a given value is alpha numeric or not

JavaScript validation with regular expression: Exercise-10 with Solution

Write a JavaScript function to check whether a given value is alpha numeric or not.

Pictorial Presentation:

JavaScript: Check whether a given value is alpha numeric or not

Sample Solution:-

HTML Code:

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

</body>
</html>

JavaScript Code:

function is_alphaNumeric(str)
{
 regexp = /^[A-Za-z0-9]+$/;
  
        if (regexp.test(str))
          {
            return true;
          }
        else
          {
            return false;
          }
}

console.log(is_alphaNumeric("37828sad"));

console.log(is_alphaNumeric("3243#$sew"));

Sample Output:

true
false

Flowchart:

Flowchart: JavaScript- Check whether a given value is alpha numeric or not

Live Demo:

See the Pen javascript-regexp-exercise-10 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 an valid url or not.
Next: Write a JavaScript function to check whether a given value is time string or not.

What is the difficulty level of this exercise?



JavaScript: Tips of the Day

JavaScript: Delete operator

const name = 'Owen';
age = 21;

console.log(delete name);
console.log(delete age);

The delete operator returns a boolean value: true on a successful deletion, else it'll return false. However, variables declared with the var, const or let keyword cannot be deleted using the delete operator.
The name variable was declared with a const keyword, so its deletion is not successful: false is returned. When we set age equal to 21, we actually added a property called age to the global object. You can successfully delete properties from objects this way, also the global object, so delete age returns true.

Ref: https://bit.ly/323Y0P6