JS - Remove all characters before/after a string (and keep that string)?

Question

I've seen several results for removing characters after a specific character - my question is how would I do that with a string?

Basically, this applies to any given string of data, but let's take a URL: stackoverflow.com/question

With given string, and in JS, I'd like to remove everything after ".com", assign ".com" to a variable, and assign the text before ".com" to a separate variable.

So, end result: var x = "stackoverlow" var y = ".com"

What I've done so far: 1) Using a combination of split, substring, etc. I can get it to remove pieces, but not without removing part of the ".com" string. I'm pretty sure I can do what I want to do with substring and split, I think I'm just implementing it incorrectly. 2) I'm using indexOf to find the string ".com" within the full string

Any tips? I haven't posted my actual code because it's become so garbled with all the different things I've tried (I can go ahead and do so if necessary).

Thanks!

What if the input is something like sub.domain.com/something - do you want the result to be sub.domain and .com? What if the input includes .net rather .com? — nnnnnn
– nnnnnn, Commented Mar 23, 2013 at 3:48
@nnnnnn The .com was there as a hypothetical - the whole script I'm creating would account for more than just the one suffix. — Andrew Defee
– Andrew Defee, Commented Mar 23, 2013 at 4:10
@Lenty, then why do you accept an answer that relies on .com? — Dagg Nabbit
– Dagg Nabbit, Commented Mar 23, 2013 at 4:12
Because its structure is the closest to what I was looking for :) — Andrew Defee
– Andrew Defee, Commented Mar 23, 2013 at 4:47

Kashif · Accepted Answer · 2013-03-23 04:02:27Z

1

You should really look into Regular Expressions.

Here is some code that can get what you are trying to do:

var s = 'stackoverflow.com/question';

var re = /(.+)(\.com)(.+)/;

var result = s.match(re); 

if (result && result.length >= 3) {

    var x = result[1], //"stackoverlow"
        y = result[2]; //".com"

    console.log('x: ' + x);
    console.log('y: ' + y);
}

answered Mar 23, 2013 at 4:02

Kashif

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Koterpillar · Accepted Answer · 2013-03-23 05:19:01Z

1

Use regular expressions.

"stackoverflow.com".match(/(.+)(\.com)/)

results in

["stackoverflow.com", "stackoverflow", ".com"]

(Why would you want to assign .com to a variable, though?

edited Mar 23, 2013 at 5:19

answered Mar 23, 2013 at 3:47

Koterpillar

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1 Comment

Andrew Defee Over a year ago

Thank you! The .com was more of a hypothetical, used in my question.

Dagg Nabbit · Accepted Answer · 2013-03-23 03:57:27Z

0

"stackoverflow.com".split(/\b(?=\.)/) => ["stackoverflow", ".com"]

Or,

"stackoverflow.com/question".split(/\b(?=\.)|(?=\/)/)
=> ["stackoverflow", ".com", "/question"]

edited Mar 23, 2013 at 3:57

answered Mar 23, 2013 at 3:50

Dagg Nabbit

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