On Sat, Apr 28, 2007 at 04:18:12PM +0200, Oliver Bandel wrote:
> The main intend of the lib (ys, a library, not a certain
> application) was to have a tool at hand, that makes
> complex things achievable easy.
[...]
>      let mymatch = match_header_regexp ".*richard" NoCase
[...]
> Opens the mbox-file "MB1" and writes
> all mails with the "richard"-string in the header
> to the mbox-file "MB1.ready".

There's a whole lots of issues that this doesn't cover.  For example,
what about internationalised headers using the (rather crazy) syntax
defined in RFC 2047?

>From the RFC:

   From: =?US-ASCII?Q?Keith_Moore?= <moore@cs.utk.edu>
   To: =?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?= <keld@dkuug.dk>
   CC: =?ISO-8859-1?Q?Andr=E9?= Pirard <PIRARD@vm1.ulg.ac.be>
   Subject: =?ISO-8859-1?B?SWYgeW91IGNhbiByZWFkIHRoaXMgeW8=?=
    =?ISO-8859-2?B?dSB1bmRlcnN0YW5kIHRoZSBleGFtcGxlLg==?=


Rich.

-- 
Richard Jones
Red Hat