match nested parenthesis

s99999999s2003 at s99999999s2003 at
Tue Jan 23 04:03:01 CET 2007

i wish to find an reg exp for matching nested parenthesis of varying
level like
string =
and be able to evaluate the pair starting from the inner most(the
deepest level) , ie (some)
up till the outer most. What is a good reg exp to do this? or is simple
string manipulations enough? 

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