Regular Expression help needed

[BHPexpert]

I want to extract all text that is contained inside the brackets after the word INDIRECT. There must be at least one pair of parentheses, they may be multiple pairs

for exampple, this string

'=IF($B$9="Off",0,INDIRECT(ADDRESS(1(8),COLUMNS($A $41:C41),,,$B$9)),()aaaa'

has four bracket pairings until the initial "(" is closed out

so the Regexp woul return

INDIRECT(ADDRESS(1(8),COLUMNS($A$41:C41),,,$B$9))

Thanks