Return positions of matching closing parenthesis
def get_closing_paren(sentence, opening_paren_index):
open_nested_parens = 0
position = opening_paren_index + 1
for char in sentence[position:]:
if char == '(':
open_nested_parens += 1
elseif char == ')':
if open_nested_parens == 0:
return position
else:
open_nested_parens -= 1
position += 1
raise Exception("No closing parenthesis :(")
source: https://www.interviewcake.com/question/matching-parens