Picking piece of string between separators


I used this pattern few times to answer a thread and thought to post it as snippet.

# picking up piece of string between separators
## function using partition, like partition
def between(left,right,s):
    before,_,a = s.partition(left)
    a,_,after = a.partition(right)
    return before,a,after

s = "bla bla blaa <a>data</a> lsdjfasdjöf (important notice) 'Daniweb forum' tcha tcha tchaa"
print between('<a>','</a>',s)
print between('(',')',s)
print between("'","'",s)
""" Output:
('bla bla blaa ', 'data', " lsdjfasdj\xc3\xb6f (important notice) 'Daniweb forum' tcha tcha tchaa")
('bla bla blaa <a>data</a> lsdjfasdj\xc3\xb6f ', 'important notice', " 'Daniweb forum' tcha tcha tchaa")
('bla bla blaa <a>data</a> lsdjfasdj\xc3\xb6f (important notice) ', 'Daniweb forum', ' tcha tcha tchaa')
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Tony Veijalainen

IT/Science/Contracts/Religious translation/interpreting FIN-ENG-FIN
Python programming


If the left tag is not found, second and third part of tuple are '', all input string is as first part of tuple returned.

If left tag is found but right not, result has after part (third part of tuple) '', and rest of string is all in second part.

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