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# test groups, and nested groups
try:
import ure as re
except ImportError:
try:
import re
except ImportError:
print("SKIP")
raise SystemExit
def print_groups(match):
print('----')
try:
i = 0
while True:
print(match.group(i))
i += 1
except IndexError:
pass
m = re.match(r'(([0-9]*)([a-z]*)[0-9]*)','1234hello567')
print_groups(m)
m = re.match(r'([0-9]*)(([a-z]*)([0-9]*))','1234hello567')
print_groups(m)
# optional group that matches
print_groups(re.match(r'(a)?b(c)', 'abc'))
# optional group that doesn't match
print_groups(re.match(r'(a)?b(c)', 'bc'))
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