12 messages in net.sourceforge.lists.courier-maildrop[maildropl] Re: Hidden Feature in Mai...
FromSent OnAttachments
Ed WildgooseMar 28, 2005 10:45 am 
Jeremy KitchenMar 28, 2005 12:09 pm 
Ed WildgooseMar 28, 2005 1:14 pm 
Ed WildgooseMar 29, 2005 8:43 am 
Paul L. AllenMar 29, 2005 3:28 pm 
Sam VarshavchikMar 29, 2005 3:41 pm 
Ed WildgooseMar 29, 2005 5:25 pm 
Sam VarshavchikMar 29, 2005 5:42 pm 
Ron JohnsonMar 29, 2005 6:37 pm 
Sam VarshavchikMar 29, 2005 7:39 pm 
Ron JohnsonMar 29, 2005 8:23 pm 
Ed WildgooseMar 30, 2005 12:23 am 
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Subject:[maildropl] Re: Hidden Feature in Maildrop?Actions...
From:Paul L. Allen (pl@softflare.com)
Date:Mar 29, 2005 3:28:51 pm
List:net.sourceforge.lists.courier-maildrop

Ed Wildgoose writes:

The regex part. I agree it's standard regex syntax, but the docs *suggest* that maildrop doesn't support standard (full) regexp.

It's a little frustrating trying to guess exactly which bits of grep regexp are supported and which are not.

Ummmmm, STANDARD regexp syntax? GREP regexp syntax? Sorry guys, see Friedl's "Mastering Regular Expressions" - there's no standard syntax. Various tools (grep, exp, sed, perl) use differing syntaxes. Different versions of those tools (such as perl 4, perl 5 and perl 6) use differing syntaxes. Different alternative derivations of those tools (grep vs gnu grep) use different syntaxes.

And just to make life even more complicated, the underlying regexp engine can mean that some regexps will take close to infinite time to complete. If you don't know what's underneath the hood you can really ruin your day.

When it comes to regexps with any particular tool, you can only trust what the docs for that tool say you can trust. Other things may work, but you're on thin ice because something that is documented is less likely to change than something that is undocumented. YMMV, etc.