# Split and Substring

**URL:** <https://discuss.elastic.co/t/split-and-substring/179536>\
**Category:** Logstash\
**Created:** [May 3, 2019, 12:36pm UTC](https://discuss.elastic.co/t/split-and-substring/179536 "2019-05-03T12:36:07Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![Akhraht](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@Akhraht](https://discuss.elastic.co/u/Akhraht)\
**Post date:** [May 3, 2019, 12:36pm UTC](https://discuss.elastic.co/t/split-and-substring/179536/1 "2019-05-03T12:36:08Z")

</div>

Hello guys,  
I have a group of strings like "lorem","ipsum", i wanna only "um" part of the string  
how i can do it

i tried mutate filter and split, split give me array but i need last two char of the array  
filter {  
mutate {  
split =\> ["message",","]  
add\_field =\> {"[@metadata][mykey]" =\> "%{[message][1]}"} //but i need [message][1][..2]  
}  
}

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<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [May 3, 2019, 1:48pm UTC](https://discuss.elastic.co/t/split-and-substring/179536/2 "2019-05-03T13:48:11Z")

</div>

```
mutate { gsub => ["[@metadata][mykey]", ".*(..)$", "\1" ] }
```

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<div class="post-metadata">

**Author:** ![Akhraht](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@Akhraht](https://discuss.elastic.co/u/Akhraht)\
**Post date:** [May 3, 2019, 2:44pm UTC](https://discuss.elastic.co/t/split-and-substring/179536/3 "2019-05-03T14:44:10Z")

</div>

can not working or idk how to append this code.

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<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [May 3, 2019, 2:51pm UTC](https://discuss.elastic.co/t/split-and-substring/179536/4 "2019-05-03T14:51:45Z")

</div>

What do you get from

```
output { stdout { codec => rubydebug } }

```

for a sample message?

---

<div class="post-metadata">

**Author:** ![Akhraht](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@Akhraht](https://discuss.elastic.co/u/Akhraht)\
**Post date:** [May 6, 2019, 5:46am UTC](https://discuss.elastic.co/t/split-and-substring/179536/5 "2019-05-06T05:46:42Z")

</div>

input {  
udp {  
port =\> xxxx  
}  
}

filter{  
mutate {  
split =\> ["message",","]  
add\_field =\> {"[@metadata][mkey]" =\> "%{[message][1]}"}  
**# try to get last 2 char**  
}  
}

output {  
kafka {  
codec =\> plain { format =\> '{"ip":"%{host}", "msg":"%{message}", "test":"%{[@metadata][mkey]}"}'}  
topic\_id =\> "test"  
message\_key =\> "%{[@metadata][mkey]}"  
}  
}

---

<div class="post-metadata">

**Author:** ![Akhraht](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@Akhraht](https://discuss.elastic.co/u/Akhraht)\
**Post date:** [May 6, 2019, 12:53pm UTC](https://discuss.elastic.co/t/split-and-substring/179536/6 "2019-05-06T12:53:41Z")

</div>

haven't any error but i get message from string %{[@metadata][mkey] not "um"

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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:** [June 3, 2019, 12:55pm UTC](https://discuss.elastic.co/t/split-and-substring/179536/7 "2019-06-03T12:55:19Z")

</div>

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