[triangle-zpug] how to match strings in python

Josh Johnson josh_johnson at unc.edu
Thu Apr 2 14:19:20 UTC 2009

Joseph Mack NA3T wrote:
> I've looked in the string methods/functions in the python docs and I 
> can't see how to do what I want, which is to find the parts of strings 
> that match. eg
> string_1 = "foobar"
> string_2 = "foobaz"
> matched_string = "fooba"
> I need to walk along the string(s) 1 char at a time, accepting 
> matching letters, till I get a mismatch, when the code exits. I was 
> expecting to be able to retrieve chars one at a time from each of the 
> two strings and test if the chars were the same.
> How do I do this in python?
> Thanks Joe
you can loop over a string like a list, like this:

for c in string1:
     for m in matched string:
          if c != m:

(untested, but the general idea)

Have you seen the 're' module? What you're talking about is basically 
what regular expressions do in the background :)


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