Possible Duplicate:
Remove text inside brackets, parens, and/or braces

I would like to replace the parenthesis and the text between parenthesis in a large text file.

Example input (content in the text file): 

Keep me (Remove Me 1). Again keep me (Remove Me 2). Again again keep me (Remove Me 3).

Output (content in a new text file): 

Keep me. Again keep me. Again again keep me.

Is it possible to do this in R (say using grep)?

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