JavaScript: Check a given value contains alpha, dash and underscore

Last update on April 24 2023 12:58:46 (UTC/GMT +8 hours)

JavaScript validation with regular expression: Exercise-20 with Solution

Write a JavaScript function to check if a given value contains alpha, a dash and an underscore.

Pictorial Presentation:

JavaScript: Check a given value contains alpha, dash and underscore

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to check a given value contains alpha, dash and underscore</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function is_alphaDash(str)
{
 regexp = /^[a-z0-9_\-]+$/i;
  
        if (regexp.test(str))
          {
            return true;
          }
        else
          {
            return false;
          }
}

console.log(is_alphaDash('12-133'));

console.log(is_alphaDash('100_23'));

Sample Output:

true
true

Flowchart:

Live Demo:

See the Pen javascript-regexp-exercise-20 by w3resource (@w3resource) on CodePen.

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