No doubt I should know this regex point but ..

[Jim Hefferon]

I am writing a class that walks through a file tree and (among other things)
filters out which files it considers. So I want to have
__init__( .. ,filterExpression='..')
For the default I want to filter nothing. So I need a Python regular expression
that never matches. What is (the best) one?

Thanks for any help,
Jim

[Aahz]

In article <54**************************@posting.google.com >,
Jim Hefferon <jh*******@smcvt.edu> wrote:

I am writing a class that walks through a file tree and (among other things)
filters out which files it considers. So I want to have
__init__( .. ,filterExpression='..')
For the default I want to filter nothing. So I need a Python regular
expression that never matches. What is (the best) one?

None

Seriously, make the default None, and test for it before trying a regex.
--
Aahz (aa**@pythoncraft.com) <*> http://www.pythoncraft.com/

This is Python. We don't care much about theory, except where it intersects
with useful practice. --Aahz