Regular expression guaranteed to fail

[Hallvard B Furuseth]

Eric Brunel wrote:

> I also looked for a never-matching re just a few days ago and ended up
> with "^(?!$)$". It's certainly not more "standard" than yours, but I
> find it a wee tad more readable (for a regular expression, I mean...):

I think e.g. r'\Zx' and r'x\A' are more readable.  In particular the
latter, but perhaps that causes Python to locate every 'x' in the string
and then check if the string starts at the next character...

-- 
Hallvard