intersection of 2 strings

[Peter Abel]

al at biolinux.ch (Antoine Logean) wrote in message news:<e3dbc412.0408030437.bc62176 at posting.google.com>...
> Hi,
> 
> What is the easiest way to get the intersection of two strings in
> python (a kind a "and" operator) ?
> ex:
> 
> string_1 = "the_car_of_my_fried_is_bigger_as_mine_but_my_girlfriend_is_more_beautifull"
> 
> string_2 =
> "my_girlfriend_is_more_beautifull_and_has_blue_eyes"
> 
> and the intersection :
> string_1 "and" string_2 = "my_girlfriend_is_more_beautifull"
> 
> thanks for your help
> 
> Antoine

If you take Jørgen Cederberg's solution you can inherit from
str and create your own "&"  operator.

>>> class mystring(str):
... 	def __and__(self,other):
... 		m = SequenceMatcher(None, self, other)
... 		equals=[]
... 		for (i,j,n) in m.get_matching_blocks():
... 			if n>1:
... 				equals.append(self[i:i+n])
... 		return equals
... 				
>>> s1=mystring(string_1)

>>> s1 & string_2
['my_girlfriend_is_more_beautifull']

Regrads
Peter