Date: Wed, 05 Apr 2006 21:31:32 +0200 From: =?UTF-8?B?RXJpayBOw7hyZ2FhcmQ=?= <norgaard@locolomo.org> To: FreeBSD Questions <questions@freebsd.org> Subject: Negative look ahead with capturing using pcre Message-ID: <44341B14.9000800@locolomo.org>
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Hi:
I am trying to write some rules for filtering email with postfix header
rules. In particular, I'd like to discard anything in a character set I
don't understand, or rather accept ascii, iso-8859-* and utf-8.
So I have created the following rule for mime header checks:
/^Content-Type:.*?charset\s*=\s*"?(?!us-ascii|iso-8859-\d+|utf-8)(.*?)"?.*$/i
WARN MHD1000 Invalid charset: "$1". Use UTF-8 or ISO-8859-X
I have two problems:
First: This rule catches a lot of legitimate mail, ascii or iso
character sets
Secondly: I'd like to catch the character set that is rejected so I can
adjust it if legitimate mail gets blocked. In the above I don't allow
windows-1252 for example.
So, how do I do negative look ahead with capturing using pcre?
Thanks, Erik
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