CODEWITHSUNDEEP
javascriptregex
Johann
Johann

Reputation: 29867

Regular expression in Javascript to test for various dates

I need a regular expression in javascript that can test for dates with the following formats:

Sorry, but I am really terrible at regular expressions. This is probably a breeze for a pro. Thanks a milion.

Upvotes: 0

Views: 63

Answers (2)

Niet the Dark Absol
Niet the Dark Absol

Reputation: 324620

Your first pattern is too different from the others to be meaningfully merged. So: \d{4}-\d\d-\d\d

For the others, you are allowing an optional . as a separator, and either two- or four-digit years. So you have: \d\d(\.?)\d\d?\1\d\d(?:\d\d)?

The \1 in the above is to basically repeat the (\.?)'s result - ie. a dot if there was a dot before, or nothing if not.

Result:

/^(?:\d{4}-\d\d-\d\d|\d\d(\.?)\d\d?\1\d\d(?:\d\d)?)$/

Upvotes: 1

LukasFT
LukasFT

Reputation: 164

Have you looked here? You don't want to use regex for stuff like this, since aforementioned 99.33.8888 isn't a date.

This clever function could solve your problem:

var isDate_ = function(input) {
    var status = false;
    if (!input || input.length <= 0) {
      status = false;
    } else {
      var result = new Date(input);
      if (result == 'Invalid Date') {
        status = false;
      } else {
        status = true;
      }
    }
    return status;
  }

Edit: I forgot you need to find something to validate. You could just run a simple regex like this: [0-9-/\.]{6,10}, which matches all of your examples

Upvotes: 1

Related Questions