Javascript regular expression to remove characters from the end of a string

I have a couple strings like:

net_weight_(lbs)
开发者_开发百科net_height_(inches)

I need a regular expression that will remove the _(x) from the end of the string. So in my two examples, I would be left with:

net_weight
net_height

Any help would be greatly appreciated

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If you'd prefer not to use regular expressions you can use lastIndexOf('_') and the get the substring up to that index.

s = s.substr(0, s.lastIndexOf('_'));

http://jsfiddle.net/Z7qrW/