Style Wikipedia Links Automatically – CSS and RegEx

I recently got the idea to have all my external links to Wikipedia have a little “W” icon next to them in order to indicate that the links went to Wikipedia.

The solution I came up with is to use some CSS and Regular Expressions to automatically add the image to any URLs that have http://en.wikipedia.org/ in them.

Here is a link to Wikipedia. (if you are not viewing my blog on a modern browser like Chrome/Firefox this may not work)

Here is an image in case you can’t see.

/* Wikipedia */
a[href^="http://en.wikipedia.org"]
{
padding-right: 15px;
background: url("/images/wikipedia.png") no-repeat scroll right top transparent;
}

You can download my little “W” icon at https://www.blakeimeson.com/images/wikipedia.png

I am sure there may be a more elegant and versatile solution to this, if you know of a way to do this better please comment below!