JavaScript: Search a date within a string

Last update on May 30 2022 10:01:18 (UTC/GMT +8 hours)

JavaScript validation with regular expression: Exercise-4 with Solution

Write a JavaScript program to search a date within a string.

Sample string:

"Albert Einstein was born in Ulm, on 14/03/1879."

Pictorial Presentation:

JavaScript: Search a date within a string

Sample Solution:-

HTML Code:

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

</body>
</html>

JavaScript Code:

function is_dateString(str)
{
 regexp = /^(1[0-2]|0?[1-9])\/(3[01]|[12][0-9]|0?[1-9])\/(?:[0-9]{2})?[0-9]{2}$/;
  
        if (regexp.test(str))
          {
            return true;
          }
        else
          {
            return false;
          }
}

console.log(is_dateString("01/01/2015"));

console.log(is_dateString("01/22/2015"));

console.log(is_dateString("32/01/2015"));

Sample Output:

true
true
false

Flowchart:

Live Demo:

See the Pen javascript-regexp-exercise-4 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: Write a pattern that matches e-mail addresses.
Next: Write a JavaScript program that works as a trim function (string) using regular expression.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04