Regular Expression - Matching Multiples of 3 Characters exactly.

[Roy Smith]

In article 
<e6f5ff9e-d074-412a-b317-c05b5b8b415c at 8g2000hse.googlegroups.com>,
 blaine <frikker at gmail.com> wrote:

> Hey everyone,
>   For the regular expression gurus...
> 
> I'm trying to write a string matching algorithm for genomic
> sequences.

I strongly suggest you stop trying to reinvent the wheel and read up on the 
Biopython project (http://biopython.org/wiki/Main_Page).