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JavaScript Exercises

JavaScript: Check whether a credit card number format is like 9999-9999-9999-9999

JavaScript validation with regular expression: Exercise-2 with Solution

Write a JavaScript program to check a credit card number ( format 9999-9999-9999-9999 ).

Sample Solution:-

HTML Code:

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

</body>
</html>

JavaScript Code:

function is_creditCard(str)
{
 regexp = /^(?:(4[0-9]{12}(?:[0-9]{3})?)|(5[1-5][0-9]{14})|(6(?:011|5[0-9]{2})[0-9]{12})|(3[47][0-9]{13})|(3(?:0[0-5]|[68][0-9])[0-9]{11})|((?:2131|1800|35[0-9]{3})[0-9]{11}))$/;
  
        if (regexp.test(str))
          {
            return true;
          }
        else
          {
            return false;
          }
}

console.log(is_creditCard("378282246310006"));

console.log(is_creditCard("37828224630006"));

Sample Output:

true
false

Flowchart:

Flowchart: JavaScript- Check whether a credit card number format is like 9999-9999-9999-9999

Live Demo:

See the Pen javascript-regexp-exercise-2 by w3resource (@w3resource) on CodePen.


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