Question

I’m using javascript regex to do the following:

I have the html content of a page saved inside a string, and I want to match all URLs on the page.

For example, if the document contains–

<script src = "http://www.a.com">
<a href="http://www.b.com">
<a href= "http://www.c.com">
<a href ="http://www.d.com">

I want the match to be–

http://www.a.com
http://www.b.com
http://www.c.com
http://www.d.com

Any help would be appreciated, thanks!

Answer 1

John Gruber has an excellent regex for URLs over at his site, Daring Fireball: http://daringfireball.net/2010/07/improved_regex_for_matching_urls

You can implement it like so:

function regex(url) {
    var regex = /(?i)\b((?:https?://|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’]))/
    return regex.test(url);
}