def parse_level_parentheses(string, open='{', close='}'):
    """ Parse a single level of matching brackets """
    stack = []
    parsed = []
    for i, c in enumerate(string):
        if c == open:
            stack.append(i)
        elif c == '}' and stack:
            start = stack.pop()
            if len(stack) == 0:
                parsed.append((string[start + 1: i]))
    return parsed