How to obtain a specified hyperlink using regular expressions or other methods

How to use regular expressions or other methods to obtain the specified hyperlink & lt; ul & nbsp; class = 'clear _ U' & gt; & lt; li & nbsp; class = 'filetype' & gt; & lt; img & nbsp; src = '/filetype/rar.gif' & nbsp; border = '0' & gt; & lt; /How to use regular expressions or other methods to obtain the specified hyperlink


All-enable small inventory invitation small helper 3.45.rar
1.40 M
21:25:55





I want to obtain a hyperlink containing the invitation keyword,
After obtaining it, it can become like this.
All-enable small memory invitation small helper 3.45.rar class border
------ Solution --------------------

Preg_match_all ('#] * href = [\' "] ([^ \ '"] *) [\ '"] [^>] *> [^ <] * invite [^ <] * # isU', $ str, $ m );