JavaScript: Check whether a given value is hexadecimal value or not

JavaScript validation with regular expression: Exercise-16 with Solution

Validate Hexadecimal

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

Visual Presentation:

Sample Solution:

JavaScript Code:

function is_hexadecimal(str)
{
 regexp = /^[0-9a-fA-F]+$/;
  
        if (regexp.test(str))
          {
            return true;
          }
        else
          {
            return false;
          }
}

console.log(is_hexadecimal("ffffff"));

console.log(is_hexadecimal("fz5500"));

Output:

true
false

Flowchart:

Live Demo:

See the Pen javascript-regexp-exercise-16 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that uses a regular expression to check if a string is a valid hexadecimal number (with or without 0x).
• Write a JavaScript function that validates a hexadecimal string by ensuring it contains only digits and letters A-F/a-f.
• Write a JavaScript function that trims the input and converts it to uppercase before validating it as a hexadecimal value.
• Write a JavaScript function that tests for both short and long hexadecimal formats and returns true if valid.

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