# test match.span(), and nested spans

try:
    import ure as re
except ImportError:
    try:
        import re
    except ImportError:
        print("SKIP")
        raise SystemExit

try:
    m = re.match(".", "a")
    m.span
except AttributeError:
    print('SKIP')
    raise SystemExit


def print_spans(match):
    print('----')
    try:
        i = 0
        while True:
            print(match.span(i), match.start(i), match.end(i))
            i += 1
    except IndexError:
        pass

m = re.match(r'(([0-9]*)([a-z]*)[0-9]*)','1234hello567')
print_spans(m)

m = re.match(r'([0-9]*)(([a-z]*)([0-9]*))','1234hello567')
print_spans(m)

# optional span that matches
print_spans(re.match(r'(a)?b(c)', 'abc'))

# optional span that doesn't match
print_spans(re.match(r'(a)?b(c)', 'bc'))