# Problem using trailing delimiter in dissect

**URL:** <https://discuss.elastic.co/t/problem-using-trailing-delimiter-in-dissect/119557>\
**Category:** Logstash\
**Created:** [February 12, 2018, 10:04pm UTC](https://discuss.elastic.co/t/problem-using-trailing-delimiter-in-dissect/119557 "2018-02-12T22:04:12Z")\
**Posts on this page:** 3\
**Page:** 1

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**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:** [February 12, 2018, 10:04pm UTC](https://discuss.elastic.co/t/problem-using-trailing-delimiter-in-dissect/119557/1 "2018-02-12T22:04:12Z")

</div>

When I dissect a message like this:

```
input { generator { message => ';abc|def;' count => 1 } }
filter { dissect { mapping => { "message" => ";%{a}|%{b};" } } }
output { stdout { codec => rubydebug } }
```

I get the trailing semi-colon included in b, which, for me, is counter-intuitive. I know I can mutate/gsub the trailing character away, but it feels wrong. Is there a way to modify the dissect string to get this to set "b" =\> "def"?

```
"message" => ";abc|def;",
      "sequence" => 0,
             "a" => "abc",
             "b" => "def;"
```

---

<div class="post-metadata">

**Author:** ![Semyon](https://avatars.discourse-cdn.com/v4/letter/s/7cd45c/32.png) [@Semyon](https://discuss.elastic.co/u/Semyon)\
**Post date:** [February 12, 2018, 11:03pm UTC](https://discuss.elastic.co/t/problem-using-trailing-delimiter-in-dissect/119557/2 "2018-02-12T23:03:34Z")

</div>

Try adding silent/ skip field, at the end of message like so:  
filter { dissect { mapping =\> { "message" =\> ";%{a}|%{b};%{}" } } }

---

<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:** [March 12, 2018, 11:03pm UTC](https://discuss.elastic.co/t/problem-using-trailing-delimiter-in-dissect/119557/3 "2018-03-12T23:03:40Z")

</div>

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