Postfix Header and Body Checks is triggering but not discard

Hello,
I have created a Postfix content filter which is also triggered according to the mail logs, but the DISCARD action is not carried out and the mails end up in my mailbox.
Does anyone have any idea why this might be?

Mail-Filter:
Filter: Header Filter
Regexp. Pattern: <.+?(@|@.*\.)dealscomparer\.com>
Action: DISCARD

Mail-Log Snip:

cat /var/log/mail.log | grep dealscomparer

Sep 20 01:43:48 ns1 postfix/smtpd[1689133]: NOQUEUE: filter: RCPT from smtp-b-118.pro-marketing-email.de[45.129.93.118]: <[email protected]>: Sender address triggers FILTER lmtp:[127.0.0.1]:10026; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<smtp-b-118.pro-marketing-email.de>

Sep 20 01:43:48 ns1 postfix/smtpd[1689133]: NOQUEUE: filter: RCPT from smtp-b-118.pro-marketing-email.de[45.129.93.118]: <[email protected]>: Sender address triggers FILTER lmtp:[127.0.0.1]:10024; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<smtp-b-118.pro-marketing-email.de>

Sep 20 01:43:48 ns1 postgrey[630]: action=pass, reason=triplet found, client_name=smtp-b-118.pro-marketing-email.de, client_address=45.129.93.118/32, sender=return-a1-8097-8101-5b2e0566=3905976=8@news.dealscomparer.com, [email protected]

Sep 20 01:43:48 ns1 postfix/cleanup[1697418]: 92AEE2740CB1: message-id=<[email protected]>

Sep 20 01:43:48 ns1 postfix/qmgr[1728]: 92AEE2740CB1: from=<[email protected]>, size=22163, nrcpt=1 (queue active)

Sep 20 01:43:54 ns1 postfix/cleanup[1697418]: DC0C12740CCC: message-id=<[email protected]>

Sep 20 01:43:54 ns1 postfix/qmgr[1728]: DC0C12740CCC: from=<[email protected]>, size=22910, nrcpt=1 (queue active)

Sep 20 01:43:54 ns1 amavis[1683044]: (1683044-05) Passed CLEAN {RelayedInbound}, [127.0.0.1] [45.129.93.118] <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: uobjpH8z-dDN, Hits: 1.95, size: 22163, queued_as: DC0C12740CCC, 6288 ms

Sep 20 01:43:54 ns1 dovecot: lda([email protected])<1697435><6MG7Nrr+KGOb5hkAukZkiQ>: sieve: msgid=<[email protected]>: stored mail into mailbox 'INBOX'
​

 

Thank you for your answer.
I just don't quite understand what's wrong with the regex. At least it matches on regex101.com with <[email protected]>.
My goal is to filter all mails from "dealscomparer.com" and its subdomains.
Do you have a tip for me?

 

Ok, i've got it. After i add slashes at begin and end of regex it works.
/<.+?(@|@.*\.)dealscomparer\.com>/