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Sed: delete on each line before a character and after a character

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# 1  
Old 02-21-2013
Sed: delete on each line before a character and after a character

Hi there,
A total sed noob here. Is there a way using sed to delete everything before a character AND after another character on each line in a file? The deletion should also delete the indicating characters(here: an opening and a closing parenthesis).
The original file would look like this:

blah (keep this) blah
bladiblah (another thing to keep) blabla

I would like the resulting file to look like this:

keep this
another thing to keep

I have already scoured the forum for answers but to no avail... Any help much appreciated. Thanks.
# 2  
Old 02-21-2013
sed 's/.*[(]//; s/[)].*//' file

This User Gave Thanks to Yoda For This Post:
# 3  
Old 02-21-2013
Thanks! That did the trick.
# 4  
Old 02-21-2013
Originally Posted by bipinajith
sed 's/.*[(]//; s/[)].*//' file

The parens are not required to be put in bracket expressions.
This User Gave Thanks to elixir_sinari For This Post:

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