#python 3.6 
#蔡军生 
#http://blog.csdn.net/caimouse/article/details/51749579 
# 
from re_test_patterns import test_patterns 
 
test_patterns( 
 'abbaabbba', 
 [('[ab]', 'either a or b'), 
  ('a[ab]+', 'a followed by 1 or more a or b'), 
  ('a[ab]+?', 'a followed by 1 or more a or b, not greedy')], 
) 

'[ab]' (either a or b)


 'abbaabbba'
 'a'
 .'b'
 ..'b'
 ...'a'
 ....'a'
 .....'b'
 ......'b'
 .......'b'
 ........'a'


'a[ab]+' (a followed by 1 or more a or b)


 'abbaabbba'
 'abbaabbba'


'a[ab]+?' (a followed by 1 or more a or b, not greedy)


 'abbaabbba'
 'ab'
 ...'aa'