CODEWITHSUNDEEP
javascriptregex
Mercer
Mercer

Reputation: 9986

How do I validate a date in this format (dd\mm\yyyy)

i have this function:

var isValidDate = function (date) {
   var regEx = /^\d{2}\\d{2}\\d{4}$/;
   return date.match(regEx) !== null;
};

I want to validate my date with this form :

23/01/2015

My question is my REGEX it is good ..?

Upvotes: 0

Views: 399

Answers (3)

Ahosan Karim Asik
Ahosan Karim Asik

Reputation: 3299

You may use html5 pattern . better pattern ^([0-2]\d|3[0-1])\\(0\d|1[0-2])\\[1-2]\d{3}$ . it will also work in regex..

<input type="text" pattern="^\d{2}\\\d{2}\\\d{4}$" /><br/>
better
<input type="text" pattern="^([0-2]\d|3[0-1])\\(0\d|1[0-2])\\[1-2]\d{3}$" />

Upvotes: 1

anubhava
anubhava

Reputation: 785058

You can use:

var regEx = /^\d{2}\\\d{2}\\\d{4}$/;

A backslash also requires escaping.

Also note that your original string also needs to have \\ for a literal backslash like this:

var matched = regEx.test('15\\11\\2015')
//=> true

For matching dd/mm/yyyy regex would be just:

var regEx = /^\d{2}\/\d{2}\/\d{4}$/;

This however would still not invalidate wrong dates like 13/13/2015

Upvotes: 1

ted
ted

Reputation: 4975

The regex is not safe. Consider 99/99/9999, an improved regex could read /^[0-3]\d\/[01]\d\/[12]\d{3}$/. However this still accept dates like39/19/2999` which is clearly illeagal.

While you can refine your regex further to limit the seperate numbers to valid ranges it becomes rather complex if you want to rule out feb 31. I recommend doing this with actual code rather than a regex.

Upvotes: 1

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