efficiently splitting up strings based on substrings
perfreem at gmail.com
Sat Sep 5 23:54:41 CEST 2009
I'm trying to efficiently "split" strings based on what substrings
they are made up of.
i have a set of strings that are comprised of known substrings.
For example, a, b, and c are substrings that are not identical to each
a = "0" * 5
b = "1" * 5
c = "2" * 5
Then my_string might be:
my_string = a + b + c
i am looking for an efficient way to solve the following problem.
suppose i have a short
string x that is a substring of my_string. I want to "split" the
string x into blocks based on
what substrings (i.e. a, b, or c) chunks of s fall into.
to illustrate this, suppose x = "00111". Then I can detect where x
starts in my_string
using my_string.find(x). But I don't know how to partition x into
on the substrings. What I want to get out in this case is: "00",
"111". If x were "001111122",
I'd want to get out "00","11111", "22".
is there an easy way to do this? i can't simply split x on a, b, or c
because these might
not be contained in x. I want to avoid doing something inefficient
like looking at all substrings
of my_string etc.
i wouldn't mind using regular expressions for this but i cannot think
of an easy regular
expression for this problem. I looked at the string module in the
library but did not see
anything that seemd related but i might have missed it.
any help on this would be greatly appreciated. thanks.
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