Middle matching - any Python library functions (besides re)?

[Paul Rubin]

"EP" <eric.pederson at gmail.com> writes:
> Given that I am looking for matches of all files against all other
> files (of similar length) is there a better bet than using re.search?
> The initial application concerns files in the 1,000's, and I could use
> a good solution for a number of files in the 100,000's.

If these are text files, typically you'd use the Unix 'diff' utility
to locate the differences.