# Grok Pattern not parsing **URL:** \ **Category:** Logstash\ **Created:** [May 11, 2016, 10:03am UTC](https://discuss.elastic.co/t/grok-pattern-not-parsing/49750 "2016-05-11T10:03:27Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![dlopez](https://avatars.discourse-cdn.com/v4/letter/d/bc79bd/32.png) [@dlopez](https://discuss.elastic.co/u/dlopez)\ **Post date:** [May 11, 2016, 10:03am UTC](https://discuss.elastic.co/t/grok-pattern-not-parsing/49750/1 "2016-05-11T10:03:27Z")
Hi, I'm trying to parse a log file with content like this: ``` 2016-05-09 12:00:00,006 INFO [com.level2.quartz.BaseLevel2EngineJob] (MVCScheduler_Worker-1) Executing job It removes expired activation codes 2016-05-09 12:00:00,006 INFO [com.seglan.mvc.batch.MvcActivationCodesJobImpl] (MVCScheduler_Worker-1) Activation codes cleanup job is running... ``` I've tested the filter using the Grok Debugger but when starting logstash, nothing is parsed. Here is my logstash.conf file: ``` input { file { path => "/home/dlopez/server.log" start_position => "beginning" } } filter { grok { match => { "message" => "%{TIMESTAMP_ISO8601:timestamp}%{SPACE}%{LOGLEVEL:level}\s+\[%{DATA:className}\]%{SPACE}%{GREEDYDATA:message}" } } } output { elasticsearch { hosts => "localhost:9200" index => "logstash-%{+YYYY.MM.dd}" } } ``` Is there any way to test the pattern? Any help would be appreciated. Thanks Regards ---
**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\ **Post date:** [May 11, 2016, 10:44am UTC](https://discuss.elastic.co/t/grok-pattern-not-parsing/49750/2 "2016-05-11T10:44:55Z")
Comment out the elasticsearch output and replace it with `stdout { codec => rubydebug }` to shorten the feedback loop. You might also find [https://github.com/magnusbaeck/logstash-filter-verifier](https://github.com/magnusbaeck/logstash-filter-verifier) useful. ---
**Author:** ![dlopez](https://avatars.discourse-cdn.com/v4/letter/d/bc79bd/32.png) [@dlopez](https://discuss.elastic.co/u/dlopez)\ **Post date:** [May 11, 2016, 12:46pm UTC](https://discuss.elastic.co/t/grok-pattern-not-parsing/49750/3 "2016-05-11T12:46:18Z")
Thank you very much! this is what I got: > { > "message" =\> "2016-05-09 12:00:00,029 DEBUG [com.googlecode.genericdao.search.BaseSearchProcessor] (MVCScheduler\_Worker-1) generateQL:", > "@version" =\> "1", > "@timestamp" =\> "2016-05-11T12:40:49.362Z", > "path" =\> "/home/dlopez/server\_test.log", > "host" =\> "sgl-v6-hce-piraeusbank-back", > "tags" =\> [ > [0] "\_grokparsefailure" > ] > } My parser is not working fine but I don't know why Thanks ---
**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\ **Post date:** [May 11, 2016, 1:21pm UTC](https://discuss.elastic.co/t/grok-pattern-not-parsing/49750/4 "2016-05-11T13:21:42Z")
Start small and increase the complexity. Begin with the simplest possible expression (`%{TIMESTAMP_ISO8601:timestamp}`) and make sure that works. Then add more and more tokens until things break. ---
**Author:** ![diwertowski](https://avatars.discourse-cdn.com/v4/letter/d/ac91a4/32.png) [@diwertowski](https://discuss.elastic.co/u/diwertowski)\ **Post date:** [May 11, 2016, 1:32pm UTC](https://discuss.elastic.co/t/grok-pattern-not-parsing/49750/5 "2016-05-11T13:32:06Z")
You can test your patterns with this debugger: [http://grokdebug.herokuapp.com/](http://grokdebug.herokuapp.com/) ---
**Author:** ![dlopez](https://avatars.discourse-cdn.com/v4/letter/d/bc79bd/32.png) [@dlopez](https://discuss.elastic.co/u/dlopez)\ **Post date:** [May 11, 2016, 1:46pm UTC](https://discuss.elastic.co/t/grok-pattern-not-parsing/49750/6 "2016-05-11T13:46:46Z")
Thanks, I've used that debugger to compose and test my pattern but unfortunately once I've moved into the system it doesn't work ---
**Author:** ![diwertowski](https://avatars.discourse-cdn.com/v4/letter/d/ac91a4/32.png) [@diwertowski](https://discuss.elastic.co/u/diwertowski)\ **Post date:** [May 11, 2016, 2:03pm UTC](https://discuss.elastic.co/t/grok-pattern-not-parsing/49750/7 "2016-05-11T14:03:04Z")
Maybe something like this? `%{TIMESTAMP_ISO8601:timestamp} %{WORD:level}\s*\[(?[A-Z,a-z,.,0-9]*)] %{GREEDYDATA:message}` ---
**Author:** ![dlopez](https://avatars.discourse-cdn.com/v4/letter/d/bc79bd/32.png) [@dlopez](https://discuss.elastic.co/u/dlopez)\ **Post date:** [May 11, 2016, 2:14pm UTC](https://discuss.elastic.co/t/grok-pattern-not-parsing/49750/8 "2016-05-11T14:14:50Z")
Ok, it seems the problem was here: > \s+[%{DATA:className}] I'm trying to parse the "class name" part of the message, I've tried the following as well but with no luck: `%{TIMESTAMP_ISO8601:timestamp}%{SPACE} %{LOGLEVEL:level} %{SPACE} %{SPACE} \[%{JAVACLASS:class}\] %{SPACE} %{GREEDYDATA:message}` Thanks ---
**Author:** ![dlopez](https://avatars.discourse-cdn.com/v4/letter/d/bc79bd/32.png) [@dlopez](https://discuss.elastic.co/u/dlopez)\ **Post date:** [May 11, 2016, 2:43pm UTC](https://discuss.elastic.co/t/grok-pattern-not-parsing/49750/9 "2016-05-11T14:43:17Z")
Well, finally I got it working: > { "message" =\> "%{TIMESTAMP\_ISO8601:timestamp} %{LOGLEVEL:level} \s+[%{JAVACLASS:class}] %{GREEDYDATA:message} " } I removed all the ${SPACE} and now it can be parsed Thanks a lot for your help and clues! ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 4:58am UTC](https://discuss.elastic.co/t/grok-pattern-not-parsing/49750/10 "2017-07-06T04:58:11Z")