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copied!<pre><code>var comp = new RegExp(location.host); $('a').each(function(){ if(comp.test($(this).attr('href'))){ // a link that contains the current host $(this).addClass('local'); } else{ // a link that does not contain the current host $(this).addClass('external'); } }); </code></pre> <p>Note: this is just a quick & dirty example. It would match all href="#anchor" links as external too. It might be improved by doing some extra RegExp checking.</p> <hr> <p><strong>Update 2016-11-17</strong></p> <p>This question still got a lot of traffic and I was told by a ton of people that this accepted solution will fail on several occasions. As I stated, this was a very quick and dirty answer to show the principal way how to solve this problem. A more sophisticated solution is to use the properties which are accessible on a <code><a></code> (anchor) element. Like @Daved already pointed out in this answer, the key is to compare the <code>hostname</code> with the current <code>window.location.hostname</code>. I would prefer to compare the <code>hostname</code> properties, because they never include the <code>port</code> which is included to the <code>host</code> property if it differs from 80.</p> <p>So here we go:</p> <pre><code>$( 'a' ).each(function() { if( location.hostname === this.hostname || !this.hostname.length ) { $(this).addClass('local'); } else { $(this).addClass('external'); } }); </code></pre> <p>State of the art:</p> <pre><code>Array.from( document.querySelectorAll( 'a' ) ).forEach( a => { a.classList.add( location.hostname === a.hostname || !a.hostname.length ? 'local' : 'external' ); }); </code></pre>

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