# Sprintf reference in grok pattern (help me~!)

**URL:** <https://discuss.elastic.co/t/sprintf-reference-in-grok-pattern-help-me/223694>\
**Category:** Logstash\
**Created:** [March 16, 2020, 6:23am UTC](https://discuss.elastic.co/t/sprintf-reference-in-grok-pattern-help-me/223694 "2020-03-16T06:23:18Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![judragon\_dark](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/judragon_dark/32/64378_2.png) [@judragon\_dark](https://discuss.elastic.co/u/judragon_dark)\
**Post date:** [March 16, 2020, 6:23am UTC](https://discuss.elastic.co/t/sprintf-reference-in-grok-pattern-help-me/223694/1 "2020-03-16T06:23:19Z")

</div>

# logstash filter code

```
 filter{
         grok {
                  patterns_dir => ["/etc/logstash/patterns/ssk-patterns"]
                  match => {"message" => "%{[fields][log_type]}"}           
         }
  }

```

[fields] [log\_type] variable is the fields set in filebeat.  
The above code does not work.

# error code output

```
:exception=>#<Grok::PatternError: pattern %{[fields][log_type]} not defined

```

I want to apply different patterns to each filebeat without using if statements.  
I couldn't solve it for 5 days.  
Helpme~~

---

<div class="post-metadata">

**Author:** ![rcowart](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rcowart/32/88091_2.png) [@rcowart](https://discuss.elastic.co/u/rcowart)\
**Post date:** [March 16, 2020, 6:38am UTC](https://discuss.elastic.co/t/sprintf-reference-in-grok-pattern-help-me/223694/2 "2020-03-16T06:38:03Z")

</div>

You won't be able to do that as both general Logstash and grok use `%{}` for different purposes.

---

<div class="post-metadata">

**Author:** ![judragon\_dark](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/judragon_dark/32/64378_2.png) [@judragon\_dark](https://discuss.elastic.co/u/judragon_dark)\
**Post date:** [March 16, 2020, 6:47am UTC](https://discuss.elastic.co/t/sprintf-reference-in-grok-pattern-help-me/223694/3 "2020-03-16T06:47:54Z")

</div>

Thank you for answer.  
If so, is there any way to apply a different pattern to each filebeat without using an if statement?

---

<div class="post-metadata">

**Author:** ![rcowart](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rcowart/32/88091_2.png) [@rcowart](https://discuss.elastic.co/u/rcowart)\
**Post date:** [March 16, 2020, 7:11am UTC](https://discuss.elastic.co/t/sprintf-reference-in-grok-pattern-help-me/223694/4 "2020-03-16T07:11:41Z")

</div>

You can include multiple patterns in the `match` parameter of your `grok` filter.

```auto
grok {
  match => {
    "[message]" => [
      "%{GROKPATTERN1}",
      "%{GROKPATTERN2}",
      "%{GROKPATTERN3}"
    ]
  }
}

```

Other than that, you will need `if` statements.

Rob

[![GitHub](https://us1.discourse-cdn.com/elastic/original/3X/6/f/6f8ae834f16b1a02d31607317669716807844d84.png)](https://github.com/robcowart) [![YouTube](https://us1.discourse-cdn.com/elastic/original/3X/4/3/43b9b81a8c93786219985aeb5335c1c323449053.png)](https://www.youtube.com/channel/UCivWvTx1DwrWNcDLV58kmOg) [![LinkedIn](https://us1.discourse-cdn.com/elastic/original/3X/6/7/674f3370d0f0542ddc5e408516beb1b7edd6c1bf.png)](https://www.linkedin.com/in/robertcowart/)  
**[How to install Elasticsearch & Kibana on Ubuntu - incl. hardware recommendations](https://www.youtube.com/watch?v=gZb7HpVOges)**  
**[What is the best storage technology for Elasticsearch?](https://www.youtube.com/watch?v=nKUpfJCBiS4)**

---

<div class="post-metadata">

**Author:** ![judragon\_dark](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/judragon_dark/32/64378_2.png) [@judragon\_dark](https://discuss.elastic.co/u/judragon_dark)\
**Post date:** [March 16, 2020, 8:57am UTC](https://discuss.elastic.co/t/sprintf-reference-in-grok-pattern-help-me/223694/5 "2020-03-16T08:57:47Z")

</div>

Thank you for answer.  
It was very helpful.

---

<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:** [April 13, 2020, 8:57am UTC](https://discuss.elastic.co/t/sprintf-reference-in-grok-pattern-help-me/223694/6 "2020-04-13T08:57:58Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.