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

JavaScript validation with regular expression: Exercise-10 with Solution

Check Alphanumeric

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

Pictorial Presentation:

Sample Solution:

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"));

Output:

true
false

Flowchart:

Live Demo:

See the Pen javascript-regexp-exercise-10 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that checks if a string contains only alphanumeric characters using a regular expression.
• Write a JavaScript function that removes all spaces and punctuation from a string and then tests for alphanumeric content.
• Write a JavaScript function that validates the input type and returns an error if it is not a string before checking.
• Write a JavaScript function that compares the original string to its alphanumeric filtered version and returns a boolean.

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