Find and replace regex JavaScript

Question

I know this is a super easy question, but I can't seem to wrap my head about it. I've got a bunch of URLs in varying languages such as:

www.myurl.com?lang=spa

www.myurl.com?lang=deu

www.myurl.com?lang=por

I need to create buttons to quickly switch from any language extension (spa, por, deu, rus, ukr, etc) to another language. I have the following code so far:

var url = window.location.toString();
window.location = url.replace(/lang=xxx/, 'lang=deu');

I just can't figure out the 3-character wildcard character. I know that I need to do some sort of regular expression or something, I'm just not sure how to go about it. Any help?

Thanks in advance

developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/…

Felix Kling
– Felix Kling

2015-01-27 00:11:55 +00:00
Commented Jan 27, 2015 at 0:11 — Felix Kling
– Felix Kling, Commented Jan 27, 2015 at 0:11

Aran-Fey · Accepted Answer · 2015-01-27 00:12:58Z

1

You can use

([&?]lang=)\w+

This will work with urls like www.myurl.com?foo=bar&lang=por&bar=foo too.

Instead of lang=deu, you'll have to replace with $1deu.

answered Jan 27, 2015 at 0:12

Aran-Fey

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maerics · Accepted Answer · 2015-01-27 00:14:26Z

1

Try ... or .{3} or \w{3} or even [a-z]{3}, depending on how specific you want to be.

var s = 'www.myurl.com?lang=spa';
s.replace(/lang=[a-z]{3}/, 'lang=deu');
// => "www.myurl.com?lang=deu"

Here's a railroad diagram of the above example:

enter image description here

edited Jan 27, 2015 at 0:14

answered Jan 27, 2015 at 0:08

maerics

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Comments

tlehman · Accepted Answer · 2015-01-27 00:17:35Z

0

Use /lang=[a-z][3}/, here's an example:

/lang=[a-z]{3}/

Regular expression visualization

Debuggex Demo

answered Jan 27, 2015 at 0:17

tlehman

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