.forward fatal regex error

[Terry Roy]

Hello,

I run exim-daemon-heavy on Trixie. I have used a .forward file for quite 
some time with no issues.  I added a new filter and tested it with:

/usr/sbin/exim4 -bf /path/to/.forward <testemail

This is the filter:

if
   $header_subject: contains "cron.daily" and
   $message_body: matches "\\N\\/etc.+:\\nTo.+git\\n.+master(?!\\n.*)\\N"
then
   logfile /var/log/vmail/filterlog
   logwrite "$tod_log Subject: $header_subject filter etckeeper"
   save /dev/null
   seen finish
endif

This is the message body I am testing against:

/etc/cron.daily/etckeeper:
To bitbucket.org:myrepos/etckeeper.git
    933a414..27bc913  master -> master


When I run exim4 -bf, I get the following output:

Filtering did not set up a significant delivery.
Normal delivery will occur.

I have tested the filter with only the $header_subject condition and it 
matches so the issue is not there. I also tested it without the negative 
lookahead and it still didn't set up a significant delivery.

I have tested the message_body regex using several online regex testers 
set to pcre and the regex matches the body text. I've read the exim docs 
on string expansion and regular expressions again as well as rereading 
the filter specification. Duck Duck Go has not been my friend.

I am at a loss. Any help would be appreciated.

-- 
Terry