Hi funky monk, $_ = '((transcription AND factor) NOT (control OR regulat) AND (TATA OR TBP) NOT (BLOOD AND marrow))'; my @caps = m/NOT # "NOT" \s* # spaces? ( # start capturing \( # "(" ^)+ # some not ")"s \) # ")" ) # end capture /xg; print join "\n", @caps; </c> Actually i want NOT terms in one array i.e(control OR regulat)(blood AND marrow) and other terms i.e(transcription AND factor)(TATA OR TBP) in other array.

In reply to Re:regular expression by funky monk by Archana
in thread Regular expreesion for extraction of words by Archana

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