# How to write regex pattern on logstash input kakfa topics\_pattern

**URL:** <https://discuss.elastic.co/t/how-to-write-regex-pattern-on-logstash-input-kakfa-topics-pattern/96705>\
**Category:** Logstash\
**Created:** [August 11, 2017, 6:15am UTC](https://discuss.elastic.co/t/how-to-write-regex-pattern-on-logstash-input-kakfa-topics-pattern/96705 "2017-08-11T06:15:38Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![sulthonzh](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sulthonzh/32/21035_2.png) [@sulthonzh](https://discuss.elastic.co/u/sulthonzh)\
**Post date:** [August 11, 2017, 6:15am UTC](https://discuss.elastic.co/t/how-to-write-regex-pattern-on-logstash-input-kakfa-topics-pattern/96705/1 "2017-08-11T06:15:38Z")

</div>

```
 kafka {
    bootstrap_servers => "localhost:9092"
    # topics => ["techsupportforum __listings","black__ listings"]
    topics_pattern => "\\*__listings"
    consumer_threads => 1
    decorate_events => true
 }

```

hi, i have logstash input kafka, i have tried, topics\_pattern but not working, if using topics working fine,

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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:** [September 8, 2017, 6:15am UTC](https://discuss.elastic.co/t/how-to-write-regex-pattern-on-logstash-input-kakfa-topics-pattern/96705/2 "2017-09-08T06:15:41Z")

</div>

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