It is falling over the [^[]. I think it is because [ is a metacharacter 
it needs to be escaped to mean the character "[". If you change it to
[^\[] then it works.

On 12/08/2016 15:44, Jacques Lav!gnotte. wrote:
> Thanks to Nick for the nice advices related to postfix. I alse have some
> set.
>
>
> I re-issue my question cause  I would like to solve it thru fail2ban :
>
>
> I wonder why this log line :
>
> Aug 10 23:56:35 emf postfix/smtpd[26006]: improper command pipelining
>   after HELO from unknown[113.57.97.103]: QUIT\r\n"  \
>
> does not match to :
>
> ^%(__prefix_line)simproper command pipelining after \S+ from
>   [^[]*\[<HOST>\]:.*$
>
> as the fail2ban rules set with the package.
>
>
> TIA, Jacques
>
>
>


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