How make regex that means "contains regex#1 but NOT regex#2" ??

[A.T.Hofkamp]

On 2008-07-01, seberino at spawar.navy.mil <seberino at spawar.navy.mil> wrote:
> I'm looking over the docs for the re module and can't find how to
> "NOT" an entire regex.

(?! R)

> How make regex that means "contains regex#1 but NOT regex#2" ?

(\1|(?!\2))

should do what you want.

Albert