Currently I have:
multiline {
type => "tomcat"
pattern => "(^.+Exception: .+)|(^\s+at .+)|(^\s+... \d+ more)|(^\s*Caused by:.+)|(---)"
what => "previous"
}
and this is part of my log:
TP-xxxxxxxxxxxxxxxxxxxxxxxx: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
at xxxxxx
Caused by: xxxxxxxxx
at xxxxxx
Caused by: xxxxxxxxx
--- The error occurred in xxxxxxxxx.
--- The error occurred xxxxxxxxxx.
My pattern doesn't work here. Probably because i added the (---) at the end. What is the correct regexp to also add the --- lines?
Thanks
You'll want to account for the other characters on the line as well:
(^---.*$)
I have put your regex and text into these online regex buddies and tried the suggestion of Eric:
http://www.regextester.com/
http://www.regexr.com/
Sometimes these online buddies really help to clear the mind. This picture shows what is recognized:
If I were stuck on this, I wouldn't focus on the regex itself any further. Rather I'd check these points:
As there are different regex dialects, what dialect is used by logstash? What does it mean to my pattern?
Are there any logstash specific modifiers that are not set and need to be set?
As Ben mentioned, there are further filter tools. Would it help to use grok instead?
If one log event start with a timestamp or a specific word, for example, in your logs if all logs start with TP, then you can use it as filter pattern.
multiline {
pattern => "^TP"
what => "previous"
negate => true
}
With this filter you can multiline your logs easy, no need to use complex patterns.
Related
i am a noob at GROK and I need to grep specific things from a logfile
Here is an example of the log:
2021-03-16 12:23:30,717 [ STATUS ] {replicate_changes } Replication status: SRC_SCN 1235720653409 - SRC_TMSTMP 2021-03-16 12:23:27 - STMTS/s 189.18 - TX/s 101.05
From that line I need to grep for:
Timestamp
Value for STMTS/s
Value for TX/s
In regex it would look something like this:
(^\d.+) \[ .+ \].+ SRC_TMSTMP (\d.+) - STMTS\/s (\d.+) - TX\/s (\d.+)
Can anyone help me solve this mystery? Thx in advance!
Note the original question asked for timestamp, and the sample regex appears to be capturing both the (presumably) receipt timestamp and "SRC_TMSTMP". The simple grok pattern below will capture both and assign appropriately:
%{TIMESTAMP_ISO8601:timestamp} %{GREEDYDATA} SRC_TMSTMP %{TIMESTAMP_ISO8601:source_timestamp} %{GREEDYDATA} STMTS/s %{BASE10NUM:stmts_per_sec:float} %{GREEDYDATA} TX/s %{BASE10NUM:tx_per_sec:float}
This could be further optimized based on additional sample data.
General grok syntax and usage is explained here: https://www.elastic.co/guide/en/elasticsearch/reference/current/grok-processor.html
Pre-defined grok patterns can be found here:
https://github.com/elastic/elasticsearch/blob/7.11/libs/grok/src/main/resources/patterns/grok-patterns
In short, grok pattern matching follows the format:
%{DEFINED_GROK_PATTERN:field_name:optional_cast_type}
Note if no field_name is specified, it will not assign the captured value to a field - essentially the same as using a regex pattern without parentheses, or a non-capturing group.
Usage of this pattern depends on where you intend to use it - Elasticsearch or Logstash (based on the question tags). If Elasticsearch, see the first link - if using Logstash, see the following: https://www.elastic.co/guide/en/logstash/current/plugins-filters-grok.html
Note a useful tool in Kibana is the Grok Debugger, which can be found under Dev Tools:
I'm trying not to match "logging 10.1.1.1".
So the Regex must match "logging 10.2.2.2" and "logging 10.3.3.3" and ANY other variation of "logging x.x.x.x". Must not match "ABC" as well.
Data Below
logging 10.1.1.1
logging 10.2.2.2
logging 10.3.3.3
ABC
I'm using Microsoft .NET Regex.
Any help would be greatly appreciated. Pulling my hair out!
Try Regex: ^(?!.*logging 10\.1\.1\.1|ABC).*$
Demo
It's likely impossible to get the right answer given how the question is posed, but it sounds like you want this:
\blogging\s(?!10.1.1.1)(?:(?:2(?:[0-4][0-9]|5[0-5])|[0-1]?[0-9]?[0-9])\.){3}(?:(?:2([0-4][0-9]|5[0-5])|[0-1]?[0-9]?[0-9]))\b
The expression will match only the pattern 'logging x.x.x.x' except 'logging 10.1.1.1'.
In C#,
Regex rgx = new Regex(#"\blogging\s(?!10.1.1.1)(?:(?:2(?:[0-4][0-9]|5[0-5])|[0-1]?[0-9]?[0-9])\.){3}(?:(?:2([0-4][0-9]|5[0-5])|[0-1]?[0-9]?[0-9]))\b");
string data = "logging 10.1.1.1\r\nlogging 10.2.2.2\r\nlogging 8.8.8.8\r\nABC";
foreach (Match match in rgx.Matches(data)) System.Console.WriteLine(match);
Outputs to console
logging 10.2.2.2
logging 8.8.8.8
So I have the following log message:
[localhost-startStop-1] SystemPropertiesConfigurer$ExportingPropertyOverrideConfigurer loadProperties > Loading properties file from class path resource [SystemConfiguration.overrides]
I'm trying to match the first thread ( [localhost-startStop-1] ) with the following pattern:
EVENT_THREAD (\[.+?\])
This works when I pass it into regex101.com but doesn't work when I represent it as
%{(\[.+?\]):EVENT_THREAD} on grokdebugger for reasons unknown to me...
Can someone help me understand this?
Thanks,
See Grok help:
Sometimes logstash doesn’t have a pattern you need. For this, you have a few options.
First, you can use the Oniguruma syntax for named capture which will let you match a piece of text and save it as a field:
(?<field_name>the pattern here)
So, use (?<EVENT_THREAD>\[.+?\]).
Alternately, you can create a custom patterns file.
Create a directory called patterns with a file in it called extra (the file name doesn’t matter, but name it meaningfully for yourself)
In that file, write the pattern you need as the pattern name, a space, then the regexp for that pattern.
# contents of ./patterns/postfix:
EVENT_THREAD (?:\[.+?\])
Then use the patterns_dir setting in this plugin to tell logstash where your custom patterns
filter {
grok {
patterns_dir => ["./patterns"]
match => { "message" => "%{EVENT_THREAD:evt_thread}" }
}
}
I'm somewhat new to ruby and have done a ton of google searching but just can't seem to figure out how to match this particular pattern. I have used rubular.com and can't seem to find a simple way to match. Here is what I'm trying to do:
I have several types of hosts, they take this form:
Sample hostgroups
host-brd0000.localdomain
host-cat0000.localdomain
host-dog0000.localdomain
host-bug0000.localdomain
Next I have a case statement, I want to keep out the bugs (who doesn't right?). I want to do something like this to match the series of characters. However, it starts matching at host-b, host-c, host-d, and matches only a single character as if I did a [brdcatdog].
case $hostgroups { #variable takes the host string up to where the numbers begin
# animals to keep
/host-[["brd"],["cat"],["dog"]]/: {
file {"/usr/bin/petstore-friends.sh":
owner => petstore,
group => petstore,
mode => 755,
source => "puppet:///modules/petstore-friends.sh.$hostgroups",
}
}
I could do something like [bcd][rao][dtg] but it's not very clean looking and will match nonsense like "bad""cot""dat""crt" which I don't want.
Is there a slick way to use \A and [] that I'm missing?
Thanks for your help.
-wootini
How about using negative lookahead?
host-(?!bug).*
Here is the RUBULAR permalink matching everything except those pesky bugs!
Is this what you're looking for?
host-(brd|cat|dog)
(Following gtgaxiola's example, here's the Rubular permalink)
I'm trying to analyze logs using splunk and I need to parse lines that look like this:
2012-06-20 20:35:13,980 INFO [http-bio-8080-exec-72] (b50f3a81-f9e0-4ebf-b9e2-b007c8dd4cbf) interceptor.CustomLoggingOutInterceptor (AbstractLoggingInterceptor.java:149) - Outbound Message
I've got this regex which matches:
(?i)^[^\]]*\]\s+(?P<FIELDNAME>[^ ]+)
this part :
2012-06-20 20:35:13,980 INFO [http-bio-8080-exec-72] (b50f3a81-f9e0-4ebf-b9e2-b007c8dd4cbf)
Using groups I can extract the real information that I need and that is :
(b50f3a81-f9e0-4ebf-b9e2-b007c8dd4cbf)
Only problem is that I don't need parenthesis, I've tried with some negative lookahead/lookbehind google searches, don't really know regex that well.
So my final goal would be to capture b50f3a81-f9e0-4ebf-b9e2-b007c8dd4cbf . thanks
(?i)^[^\]]*\]\s+\((?P<FIELDNAME>[^ ]+)\)
That matches and drops the () in group 1.
Play with the regex here.