RE: getting "and" operator work

[vertito <ve...@aim-consultants.com>]

am very glad for all this big help. now AND is working the way i youve advised me.
thanks a lot!

-----Original Message-----
From: Matt Kettler [mailto:mkettler_sa@verizon.net] 
Sent: Tuesday, November 28, 2006 5:02 AM
To: John Rudd
Cc: users@spamassassin.apache.org
Subject: Re: getting "and" operator work

John Rudd wrote:
> Matt Kettler wrote:
>> John Rudd wrote:
>>> Matt Kettler wrote:
>>>
>>>> Really in regexes there is no such thing as an AND operation. It's 
>>>> just not something natural to do in a regex.
>>> I would argue, at a deeper level of language/grammar theory, that 
>>> this isn't true.  Instead, AND is implied by concatenation.
>> No it's not. Concatenation is order-specific. AND is order non-specific.
>>
>
> I'd have to break out a textbook (which means _find_ my textbooks on 
> the material) to continue the discussion meaningfully.  I'm just glad 
> anyone at all replied to the question meaningfully :-}
>
>
The key is that in boolean algebra, AND has the commutative property.
This means that A and B is the same as B and A.