# Logstash unable to gsub a pattern

**URL:** <https://discuss.elastic.co/t/logstash-unable-to-gsub-a-pattern/210273>\
**Category:** Logstash\
**Created:** [December 3, 2019, 3:36am UTC](https://discuss.elastic.co/t/logstash-unable-to-gsub-a-pattern/210273 "2019-12-03T03:36:30Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Abhishek\_Kumar4](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/abhishek_kumar4/32/46385_2.png) [@Abhishek\_Kumar4](https://discuss.elastic.co/u/Abhishek_Kumar4)\
**Post date:** [December 3, 2019, 3:36am UTC](https://discuss.elastic.co/t/logstash-unable-to-gsub-a-pattern/210273/1 "2019-12-03T03:36:31Z")

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I am sending below log file from filbeat to Logstash. The below is the output from filbeat to Logstash  
This output I got by setting filebeat output to stdout to see what is being sent to Logstash

`\u001b[m\u001b[32m[2019-12-02T17:30:09,995] INFO - [http-nio-8080-exec-9:40] {client_ip=13.232.113.45, request_id=8D9383C6E4FD40EC90324627F8EF839C} [filter.RequestAndResponseLoggingFilter.doFilterInternal:113] Response body: {\"status\":\"success\",\"message\":\"success\"}"`

I want to remove `\u001b[m\u001b[32m`

I added below setting in gsub for logstash but it still comes in Kibana `["message","^\\u001b\[m\\u001b\[32m"," "]`

I added logstash output to stdout and saw below log as output

\e[m\e[32m[2019-12-03T08:36:16,936] INFO - [http-nio-8080-exec-9:40] {client\_ip=x.x.x.x, request\_id=DB2126E745454EE88E7090DB403B1864} [filter.RequestAndResponseLoggingFilter.doFilterInternal:90] =\> [6936] GET

I added multiple gsub still it's not helping

filter{

```
 mutate {
          gsub => ["message", "\\u001b\[m\\u001b\[32m"," "]
        }
 mutate {
          gsub => ["message", "\\e\[m\\e\[32m"," "]
        }
 mutate {
          gsub => ["message", "\[m\[32m"," "]
        }

```

}

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<div class="post-metadata">

**Author:** ![Abhishek\_Kumar4](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/abhishek_kumar4/32/46385_2.png) [@Abhishek\_Kumar4](https://discuss.elastic.co/u/Abhishek_Kumar4)\
**Post date:** [December 5, 2019, 9:35am UTC](https://discuss.elastic.co/t/logstash-unable-to-gsub-a-pattern/210273/2 "2019-12-05T09:35:21Z")

</div>

mutate {  
gsub =\> ["message", ".+?(?=[[0-9]{4}-[0-9]{2}-[0-9]{2})", ""  
}

Above GSUB mutate anything before Date. This resolved the issue

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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:** [January 2, 2020, 9:47am UTC](https://discuss.elastic.co/t/logstash-unable-to-gsub-a-pattern/210273/3 "2020-01-02T09:47:53Z")

</div>

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