>>r = re.compile("[^a]*a{3}b+(a+b*)*")
>>matches = [s for s in listOfStringsToTest if r.match(s)]
>
> Wow, I like it, but it allows some strings it shouldn't. For example:
>
> "xyz123aabbaaab"
>
> (It skips over the two-letter sequence of 'a' and matches 'bbaaab'.)
Anchoring it to the beginning/end might solve that:
r = re.compile("^[^a]*a{3}b+(a+b*)*$")
this ensures that no "a"s come before the first 3x"a" and nothing
but "b" and "a" follows it.
-tkc
(who's translating from vim regexps which are just diff. enough
to throw a wrench in works...)
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