Python Regular expression greedy match and non-greedy match

Python's regular expression defaults to "greedy match", that is, in the case of a second meaning, match the longest string as possible, followed by a question mark after the curly brace of the regular expression, can become non-greedy mode

>>>
>>> Haregex=re.compile (R ' (ha) {3,5} ')
>>> m=haregex.search (' Hahahahahaha ')
>>> print (M.group ())
Hahahahaha
>>>

The above output of 5 ha, is greedy match

>>>
>>> Haregex=re.compile (R ' (ha) {3,5}? ')
>>> m=haregex.search (' Hahahahahaha ')
>>> print (M.group ())
hahaha
>>>

Above output 3 ha, non-greedy match

Python Regular expression greedy match and non-greedy match