# Using @metadata in logstash custom pattern for grok?

**URL:** <https://discuss.elastic.co/t/using-metadata-in-logstash-custom-pattern-for-grok/67177>\
**Category:** Logstash\
**Created:** [November 25, 2016, 10:55am UTC](https://discuss.elastic.co/t/using-metadata-in-logstash-custom-pattern-for-grok/67177 "2016-11-25T10:55:40Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![YuWatanabe](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yuwatanabe/32/13259_2.png) [@YuWatanabe](https://discuss.elastic.co/u/YuWatanabe)\
**Post date:** [November 25, 2016, 10:55am UTC](https://discuss.elastic.co/t/using-metadata-in-logstash-custom-pattern-for-grok/67177/1 "2016-11-25T10:55:41Z")

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Hi.

I am trying to use @metadata in logstash custom pattern for grok. But looks like **@** is not allowed when using in the fieldname. Is there any way to escape @ in the custom pattern?

[2016-11-25T19:51:21,685][ERROR][logstash.agent] Pipeline aborted due to error {:exception=\>#\<RegexpError: invalid char in group name \<[@metadata][datetime]\>: /(?:(?\<[@metadata][datetime]\>(?:(?\>\d\d){1,2})-(?:(?:0?[1-9]|1[0-2]))-(?:(?:(?:0[1-9])|(?:[12][0-9])|(?:3[01])|[1-9]))[]+(?:(?!\<[0-9])(?:(?:2[0123]|[01]?[0-9])):(?:(?:[0-5][0-9]))(?::(?:(?:(?:[0-5]?[0-9]|60)(?:[:.,][0-9]+)?)))(?![0-9]))) (?NUMBER:thread\_id(?:(?:(?\<![0-9.+-])(?\>[+-]?(?:(?:[0-9]+(?:.[0-9]+)?)|(?:.[0-9]+)))))) [(?WORD:error\_type\b\w+\b)](?:.\*))/m\>, :backtrace=\>["org/jruby/RubyRegexp.java:1434:in `initialize'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/jls-grok-0.11.4/lib/grok-pure.rb:127:in`compile'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-grok-3.3.0/lib/logstash/filters/grok.rb:272:in `register'", "org/jruby/RubyArray.java:1613:in`each'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-grok-3.3.0/lib/logstash/filters/grok.rb:267:in `register'", "org/jruby/RubyHash.java:1342:in`each'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-grok-3.3.0/lib/logstash/filters/grok.rb:262:in `register'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:197:in`start\_workers'", "org/jruby/RubyArray.java:1613:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:197:in`start\_workers'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:153:in `run'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:250:in`start\_pipeline'"]}

My grok definition is below.

`(?<[@metadata][datetime]>%{YEAR}-%{MONTHNUM}-%{MONTHDAY}[]+%{TIME}) %{NUMBER:thread_id} \[%{WORD:error_type}\]%{GREEDYDATA}`

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<div class="post-metadata">

**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:** [November 27, 2016, 8:44pm UTC](https://discuss.elastic.co/t/using-metadata-in-logstash-custom-pattern-for-grok/67177/2 "2016-11-27T20:44:24Z")

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No, I don't think it's possible to capture into fields under `@metadata`.

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<div class="post-metadata">

**Author:** ![YuWatanabe](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yuwatanabe/32/13259_2.png) [@YuWatanabe](https://discuss.elastic.co/u/YuWatanabe)\
**Post date:** [November 28, 2016, 10:03am UTC](https://discuss.elastic.co/t/using-metadata-in-logstash-custom-pattern-for-grok/67177/3 "2016-11-28T10:03:30Z")

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@magnusbaeck

Ok. Thanks.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 26, 2016, 10:03am UTC](https://discuss.elastic.co/t/using-metadata-in-logstash-custom-pattern-for-grok/67177/4 "2016-12-26T10:03:34Z")

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