Match First Sequence in Regular Expression?

[Christoph Conrad]

Hello Roger,

> since the length of the first sequence of the letter 'a' is 2. Yours
> accepts it, right?

Yes, i misunderstood your requirements. So it must be modified
essentially to that what Tim Chase wrote:

    m = re.search('^[^a]*a{3}b', 'xyz123aabbaaab')

Best wishes from germany,
 Christoph