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Date: Fri, 28 Sep 2012 21:17:07 -0500
From: Tim Chase <python.list@tim.thechases.com>
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To: Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject: Re: write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
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On 09/28/12 20:58, Mark Lawrence wrote:
> On 29/09/2012 02:35, Tim Chase wrote:
>> On 09/28/12 19:31, iMath wrote:
>>> write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
>>
>> Okay, that was pretty easy.  Thanks for the challenge :-)
> 
> What's the run time speed like?

O(1)

r = re.compile(
    "800-555-1212|"
    "555-1212|"
   r"\(800\) 555-1212"
    )

(okay, so I also have one that solves the OP's underqualified
problem, but without the OP at least *trying* to code up an answer
and asking for help with it, I've give the snarky solution :-)

> How much memory does it use? 

Insignificant.

> Shouldn't you be using the regex module from pypi instead of the
> standard library re? 

Only if the OP requested it ;-)

> Guess who's borrowed the time machine?

Neutrino!

-tkc