Write a function that, given a sentence, along with the position of an opening parenthesis, finds the corresponding closing parenthesis.

matching-parens.py

openers = "({["
closers = ")}]"

def paranthesis_match(string, pos):
    stack = [string[pos]]
    for i in range(pos + 1, len(string)):
        if string[i] in openers:
            stack.append(string[i])
        if string[i] in closers:
            stack.pop()
        if len(stack) == 0:
            return i

print paranthesis_match("Sometimes (when I nest them (my parentheticals) too much (like this (and this))) they get confusing.", 10)