[exim] Filter fails on emails with Chinese text

#000-

Hi,

We have written a filter that scans the content of an outgoing email looking
for a user-entered job code, in the format #000-

If the job code exists, the email is sent. If not, it is bounced back to
the sender.

We are now communicating with Chinese companies, and have found that emails
we write in Chinese fail the filter test, even if the job code is included.
The key differences between the emails appear to be as follows:

Chinese email:

       charset="gb2312"
 Content-Transfer-Encoding: quoted-printable

English email:

       charset="us-ascii"
 Content-Transfer-Encoding: 7bit

Our filter contains the following line to test for the job number:

if $message_body does not match "(?:#[0-9]{3}-)"

Anybody know what might be happening?

Thanks!

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