Getting the last number in a string (JavaScript)

Question

var str = "7-Dec-1985" var str = "12-Jan-1703" var str = "18-Feb-1999"

How would I got about pulling just the year out of the string? I have tried a number of different RegExp but none seem to be working.

I would have expected re = new RegExp(/(\d+)\D*\z/); To have worked but sadly it did not.

Any suggestions would be very appreciated

Note that re = new RegExp(/(\d+)\D*\z/); is actually creating two regex objects, the first being /(\d+)\D*\z/ which is then passed to the RegExp contstructor. Normally you would use new RegExp only if you have the need construct the pattern dynamically which you would then pass as a string to the constructor. In all other cases re = /(\d+)\D*\z/; is perfectly ok. — Yoshi
– Yoshi, Commented Dec 6, 2011 at 23:56
There's no reason you need a regular expression here. RegExp is, in general, expensive and should be used with care. — emyller
– emyller, Commented Dec 7, 2011 at 0:03

Gabriele Petrioli · Accepted Answer · 2011-12-06 23:52:14Z

19

this should do it

var year = str.match(/\d+$/)[0];

answered Dec 6, 2011 at 23:52

Gabriele Petrioli

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2 Comments

fionbio Over a year ago

FYI str.match returns null if nothing found

node_saini Over a year ago

this does not work if the string has anything else after the last number

Pierre · Accepted Answer · 2011-12-06 23:51:47Z

16

Since all of your str(s) use - as a separator, this will work for you:

var str = "7-Dec-1985",
    arr = str.split('-'),
    year = arr[2];

console.log(year);

answered Dec 6, 2011 at 23:51

Pierre

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4 Comments

Alex Wayne Over a year ago

Never use a regex when you can use a split.

Chris Over a year ago

Thanks very much, this works perfectly. Turns out though that there is a bit more information after the year. "7-Dec-1985 12:00 AM" Am I able to easily remove the time from the string?

Yoshi Over a year ago

"7-Dec-1985 12:00 AM".split(' ')[0].split('-')[2]

Chris Over a year ago

Simply parsing the result into an int solved this issue. Cheers again!

CodeSlinger · Accepted Answer · 2011-12-06 23:53:53Z

3

I'd try: /.*(\d{4})$/

Test your regex's here: http://www.regular-expressions.info/javascriptexample.html

answered Dec 6, 2011 at 23:53

CodeSlinger

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