SPUG: [OT] procmail extended regexp Re: Regular Expression

[John W. Krahn]

John Costello wrote:
> On Thu, 7 Jul 2005, Duane Blanchard wrote:
> 
>>My favorite online reference is http://www.regular-expressions.info/
>>which covers more material for more environments than I can fathom.
> 
> Related to regular expressions, does anyone know of a good discussion of 
> procmail's regular expressions?  I encountered an odd example (discussed 
> earlier this month on LondonPM) in which I wasn't sure if procmail would 
> treat $? as an environment variable or an optional end-of-line character.

You can't use quantifiers with zero-width assertions because they match at a 
position in the string not any characters.  If you want an optional 
end-of-line you have to do something like "($|)" (match end-of-line or nothing.)


John
-- 
use Perl;
program
fulfillment