hi, I am using PHP 4, that is what the host has at the moment. How can I extract link from a string when given part of the link to find.

Example
$find_string = 'http://www.mysite.com/apple';
$string = 'Something and something else < a href="http://www.mysite.com/apple_banana">testlink< /a> something else and so forth < a href="http://www.mysite.com/orange">orange< /a>
In this case I would like to extract only the links that has http:// www.mysite.com/apple in it so it would retrieve http://www.mysite.com/apple_bananan

Any help would be greatly appreciated.