Postmap and regexp.pcre

Anyone got any ideas as to why my postmap isn't doing as it's supposed to?

I have header_checks as shown below and a sample email, but postmap doesn't
seem to work in the way it's supposed to.

header_checks:-

/^Subject: .*Affordable Health Coverage/ REJECT
/^Subject: .*Affordable Health Insurance/ REJECT
/^Subject: .*Aging Breakthrough/ REJECT

test email:-

From: Postmaster@here.com
To: Postmaster@there.com
Cc:
Bcc:
Subject: Affordable Health Coverage
Reply-To:

# postmap -q - regexp:/tmp/header_checks < /tmp/testmail

Gives nothing

# postmap -q "Subject: Affordable Health Coverage" regexp:/tmp/header_checks
# REJECT

As you can see it seems to work there. Any ideas why the first one doesn't
work, which is how it's suppose to - pcre does the same btw?


Cheers,

Pete