RegExp Problem

<META NAME="class" CONTENT="我是人（哈哈）（呵呵）">
<META NAME="class" CONTENT="我是人（你好）">
<META NAME="class" CONTENT="我是人">

Maybe there are three modes in the HTML file..

(Sometimes appears line 1, sometimes appears line2, sometimes appears line3)

But how do I use one pattern to get  我是人    PS.(maybe other words, just grab the value from this position)



Thanks a lot.