Identify a link from html using PHP regular expressions

[deane034]

Hi,

I’m developing a wordpress theme, and I want to extract all the HTML Links (hrefs) with the extension of MP3 into my side bar. I know the wordpress functions to get posts, etc. What I want to know is how to use PHP regular expressions to get a link for an .mp3 that exist as a link from a string variable.

For example suppose the string is,

Code:

$mystring= “

Hello this is a WP post. Here is a link to mp3

“;

I want to be able to have a function which returns "somefile.mp3" However, I want only the links with a particular extenstion (e.g. .mp3) to be returned and not merely all the href links.

I’m a bit of a noob when it comes to PHP regular expressions, Any help would be much appreciated.

Thanks,
Deane.

[john010117]

http://php.net/preg_match

The regular expression should be something like:

Code:

/^(([A-Za-z0-9-_]+).(mp3))+/

Try experimenting with the regex to get what you want (this would be a very helpful tool).

Code:

<?php
$mystring = ‘<p> Hello this is a WP post. <a href=”somefile.mp3″>Here is a link to mp3</a></p>’;

preg_match(‘/^(([A-Za-z0-9-_]+).(mp3))+/’, $mystring, $matches);

var_dump($matches); ?>

[matt25]

Have a look at http://blog.themeforest.net/screencasts/a-crash-course-in-regular-expressions/ screen cast or the series http://blog.themeforest.net/screencasts/regular-expressions-for-dummies/ from the Theme Forest blog for great tutorials on Regular expressions.
Matt

[Author]

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