Extracing bracket matching texts

[Dhiraj Kapoor]

Hi,     I need to extract bracket matching text from text full of opening and closing brackets like     ( A = (B= (D = 1) (P =1 )) ( F = (Y = 2 ) ( w = 3)) (B = (D = 3) ( P = 4)) )         I need to extract text starting from (B =  or ( F =  or all texts starting with (B =  like to the text for "(B ="  will be "B= (D = 1) (P =1 )" and  "B = (D = 3) ( P = 4)".        Basically, to get texts starting with open paranthesis and its closing parenthesis knowing the first word of the starting parenthesis     thanks Dhiraj