Strip text in parenthesis

[zzz]

I have a loop that outputs strings of text:

$str = 'Tasdasd asda dasdasdasdad (asdasdasd)';

I need to remove the part that's enclosed in ( ) from the end of the. I thing I need regular expressions for it.

I know that my match is this: (.*)
and my function

 preg_replace($pattern, $replacement, $string);

Putting it together messes all up. I think I need to escape properly. Could use some help at this point putting it together.

[laserlight]

A quick example:

<?php
$str = 'Tasdasd asda dasdasdasdad (asdasdasd)'; 
$str = preg_replace('/\(.*\)$/', '', $str);
echo $str;