# Extract multiple substrings from a field using grok

**URL:** <https://discuss.elastic.co/t/extract-multiple-substrings-from-a-field-using-grok/319071>\
**Category:** Logstash\
**Created:** [November 16, 2022, 12:13pm UTC](https://discuss.elastic.co/t/extract-multiple-substrings-from-a-field-using-grok/319071 "2022-11-16T12:13:22Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Matan\_Malka](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/matan_malka/32/99030_2.png) [@Matan\_Malka](https://discuss.elastic.co/u/Matan_Malka)\
**Post date:** [November 16, 2022, 12:13pm UTC](https://discuss.elastic.co/t/extract-multiple-substrings-from-a-field-using-grok/319071/1 "2022-11-16T12:13:22Z")

</div>

Hi,  
I'm trying to extract the job name ("create-machine") and the build number ("\*\*") from the file path but it is not possible to use duplicate keys.  
Do you have any other suggestions?

```auto
input{
 file{
	  path => ["/bitnami/jenkins/jenkins_home/jobs/create-machine/builds/ **/log", "/bitnami/jenkins/jenkins_home/jobs/delete-machine/builds/** /log"]
	  add_field => { "test" => "temp" }
	  max_open_files => 99999
	  # Any line not starting with a timestamp should be merged with the previous line
	codec => multiline {
	  # Regex for iso datetime
	  pattern => "\[(\d{4}-\d{2}-\d{2})[A-Z]+(\d{2}:\d{2}:\d{2}).([0-9+-:]+)Z\]"
	  negate => true
	  what => "previous"
	}
 }
}
filter {
	if [test] == "temp" {
		dissect {
		  mapping => {
			"message" => "%{timestamp} %{message}"
			}
		}
		mutate {
			copy => { "%{path}" => "componentPath" }
		}
		grok {
			match => {
				"%{componentPath}" => ["(?<component>(?<=jobs\/).*?(?=\/builds))"]
				"%{componentPath}" => ["(?<module>(?<=builds\/).*?(?=\/log))"]
			}
		}
	}
    else if ("_dissectfailure" in [tags]) {
        drop { }
    }
}

```

---

<div class="post-metadata">

**Author:** ![leandrojmp](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/leandrojmp/32/107231_2.png) [@leandrojmp](https://discuss.elastic.co/u/leandrojmp)\
**Post date:** [November 16, 2022, 12:16pm UTC](https://discuss.elastic.co/t/extract-multiple-substrings-from-a-field-using-grok/319071/2 "2022-11-16T12:16:10Z")

</div>

Since the path won't change, why do not use dissect?

```auto
filter {
    dissect {
        mapping => {
            "path" => "/bitnami/jenkins/jenkins_home/jobs/%{jobName}/builds/%{buildNumber}/log"
        }
    }
}

```

---

<div class="post-metadata">

**Author:** ![Matan\_Malka](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/matan_malka/32/99030_2.png) [@Matan\_Malka](https://discuss.elastic.co/u/Matan_Malka)\
**Post date:** [November 16, 2022, 12:26pm UTC](https://discuss.elastic.co/t/extract-multiple-substrings-from-a-field-using-grok/319071/3 "2022-11-16T12:26:13Z")

</div>

Thanks a lot.  
I didn't know I could use it this way.

---

<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 14, 2022, 12:27pm UTC](https://discuss.elastic.co/t/extract-multiple-substrings-from-a-field-using-grok/319071/4 "2022-12-14T12:27:13Z")

</div>

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