This may be a simple question, but in my logs the spaces between different fields are uncertain, that mean in some logs I can see two spaces and in some three between the same fields. How do we accommodate this in GROK?
You can use %{SPACE}* in your grok pattern for matching uncertian number of spaces. It will match even if spaces are present or not.
Grok is at it's heart an overlay on Regex's. So in your grok pattern, you can directly use Regex syntax:
%{WORD} +%{WORD}
So "space+" means one or more spaces. "space*" means 0 or more spaces.
Grok also has a pattern %{SPACE} that is equivilent to " *"
Related
I have the following log which was generated using log4net
2017-12-11 17:01:28,390 [6] INFO DAL.DBManager "FunctionName":"Dispose"
The problem is the 2 spaces after INFO. If the word is debug it seems to only have 1 space, so it could be "tab".
I'm using http://grokdebug.herokuapp.com/ but my pattern, below, doesn't seem to work.
%{TIMESTAMP_ISO8601} \[%{NUMBER:thread}\] %{LOGLEVEL:log-level} %{DATA:CLASS} %{DATA:Function} %{DATA:FunctionName} %{GREEDYDATA:remainder}
I've tried adding %{SPACE} instead of the space but it doesn't generate anything.
If you want to match exactly two whitespaces, you'll have to add two whitespaces in your pattern aswell. Following pattern seems to match the line you wrote:
%{TIMESTAMP_ISO8601} \[%{NUMBER:thread}\] %{LOGLEVEL:log-level} %{DATA:CLASS}\.%{DATA:Function} %{DATA:FunctionName}\:%{GREEDYDATA:remainder}
If you want to match one or two whitespaces you can use a whitespace and an optional whitespace ( )? like so:
%{TIMESTAMP_ISO8601} \[%{NUMBER:thread}\] %{LOGLEVEL:log-level} ( )?%{DATA:CLASS}\.%{DATA:Function} %{DATA:FunctionName}\:%{GREEDYDATA:remainder}
Please see image. How the heck do you get a simple [a-zA-Z] expression to work in the KIBANA X-Pack Grok debugger?
I've tried several flavors and have ran the regex just fine in normal regex testing environments where it finds all that I need but this debugger wants something that I cannot figure out. Again this is a CUSTOM regular expression not the pre-built ones.
[a-z]
[A-Z]
[a-zA-Z]
([a-zA-Z]+)
and more
The first box is the data string, the second box is the pattern and the last box is where you define custom patterns. You have no pattern and the syntax for defining a custom pattern is wrong.
In the second box type
%{MY_REGEX:results}
In the third box type
MY_REGEX [a-z]
This creates a new pattern called MY_REGEX which can be used in the actual search pattern.
That matches the first character of the data, which is unlikely to be what was intended, but that should get you started.
See also https://www.elastic.co/guide/en/kibana/current/grokdebugger-getting-started.html#grokdebugger-custom-patterns
I am using grok pattern to match "java_1204569_priority2" this line. I want to get digits as job id. But while parsing underscore character causing problem. Can anyone help in this.
Why its so hard:
java_%{INT:jobid}_priority2
i have some sting like "John-Raj " I would like to combine these two as a single field in logstash by using grok pattern.
So I want the output as like below. But I am not able to get the output as single field by using \%{WORD} and %{NOTSPACE}
"John-Raj"
And ideas how to create grok to output?
%{WORD} is alphanumeric and underscore, so it won't match your hyphen.
%{NOTSPACE} matches in the debugger.
If you have quoted text yo may use %{QS} pattern.
I was looking how to combine several patterns to build the one value as well.
Found here
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 in your case the following will make value = "John-Raj" (tested in the debugger)
(?<value>%{WORD}%{NOTSPACE})
In PDP11/40 assembling language a number ends with dot is interpreted as a decimal number.
I use the following pattern but fail to match that notation, for example, 8.:
syn match asmpdp11DecNumber /\<[0-9]\+\.\>/
When I replace \. with D the pattern can match 8D without any problem. Could anyone tell me what is wrong with my "end-with-dot" pattern? Thanks.
Your regular expression syntax is fine (well, you can use \d instead of [0-9]), but your 'iskeyword' value does not include the period ., so you cannot match the end-of-word (\>) after it.
It looks like you're writing a syntax for a custom filetype. One option is to
:setlocal filetype+=.
in a corresponding ~/.vim/ftplugin/asmpdp11.vim filetype plugin. Do this when the period character is considered a keyword character in your syntax.
Otherwise, drop the \> to make the regular expression match. If you want to ensure that there's no non-whitespace character after the period, you can assert that condition after the match, e.g. like this:
:syn match asmpdp11DecNumber /\<\d\+\.\S\#!/
Note that a word is defined by vim as:
A word consists of a sequence of letters, digits and underscores, or a
sequence of other non-blank characters, separated with white space
(spaces, tabs, ). This can be changed with the 'iskeyword'
option. An empty line is also considered to be a word.
so your pattern works fine if whitespace follows the number. You may want to skip the \>.
I think the problem is your end-of-word boundary marker. Try this:
syn match asmpdp11DecNumber /\<[0-9]\+\./
Note that I have removed the \> end-of-word boundary. I'm not sure what that was in there for, but it appears to work if you remove it. A . is not considered part of a word, which is why your version fails.