Re: [syslog-ng] Rewrite regex not working entirely

16 Jan 2019

      Hi Max,

I tried "\w\d" , etc... in "pcre" type subst rewrite rule on 3.19.
My config:

@version: 3.19
@include "scl.conf"

source s_udp5001 {
  udp(
    port(5001)
    keep-hostname(yes)
    flags(no-parse)
  );
};

destination d_test {
  file(
    "/tmp/test.log"
  );
};

rewrite r_chars {
  subst(
    "^[a-z]+ [0-9]+ [0-9]+:[0-9]+:[0-9]+ [a-z]+: ",
    "",
    value("$MESSAGE"),
    type("pcre"),
    flags("ignore-case")
  );
};

rewrite r_pcre {
  subst(
    '^\w+\s\d+\s\d+:\d+:\d+\s\w+:\s',
    "",
    value("$MESSAGE"),
    type("pcre"),
    flags("ignore-case")
  );
};

log {
  source(s_udp5001);
  #rewrite(r_chars);
  rewrite(r_pcre);
  destination(d_test);
};

I think you need to make sure, that the regular expression is set between
single quotes (e.g.: '^\w+\s\d+\s\d+:\d+:\d+\s\w+:\s')

Best regards,
Attila

On Tue, Jan 15, 2019 at 11:12 PM N. Max Pierson <nmaxpierson@gmail.com>
wrote:
...
Hi Evan,
I have tried both pcre and posix and neither seem to work.
On Tue, Jan 15, 2019 at 4:08 PM Evan Rempel <erempel@uvic.ca> wrote:
...
You have defined your regular expresion as "posix" which does not have
the \d \s etc.
If you change the type to "pcre" then it should work for you.
On 1/15/19 2:01 PM, N. Max Pierson wrote:
Hi List,
I am using version 3.5 and it seems as though regex (posix or pcre)
doesn't work completely. Take the example string below (which is the
message part of the syslog).
Jan 15 15:50:57 CST: %DAEMON-3-SYSTEM_MSG: NTP Receive dropping message:
Received NTP control mode packet. Drop count:147972  - ntpd[15029]
I am trying to match the date at the beginning of the message and remove
it. When I use \w, \s, \d, etc, they do not match anything. If I match on a
character classes it works fine (ex [a-z]+ or [0-9]+).
Here is my statement for the rewrite rule.
rewrite r_nexus{ subst("^[a-z]+ [0-9]+ [0-9]+:[0-9]+:[0-9]+ [a-z]+: ",
"", value("MESSAGE"), type("posix"), flags("ignore-case"),
condition(filter(f_nexus))); };
The above seems to get me what I want but are the character matches not
supposed to work in syslog-ng version 3.5??
Regards,
Max
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http://www.balabit.com/support/documentation/?product=syslog-ng
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Re: [syslog-ng] Rewrite regex not working entirely

Szakacs, Attila