# Log4net to logstash

**URL:** <https://discuss.elastic.co/t/log4net-to-logstash/286250>\
**Category:** Logstash\
**Created:** [October 8, 2021, 2:13pm UTC](https://discuss.elastic.co/t/log4net-to-logstash/286250 "2021-10-08T14:13:47Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Vinicius\_Mylonas](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vinicius_mylonas/32/95611_2.png) [@Vinicius\_Mylonas](https://discuss.elastic.co/u/Vinicius_Mylonas)\
**Post date:** [October 8, 2021, 2:13pm UTC](https://discuss.elastic.co/t/log4net-to-logstash/286250/1 "2021-10-08T14:13:47Z")

</div>

I'm trying to get a log like this from log4net:

```auto
[27][14:08:36.584]
[{"name":"Vinicius","SerialNumber":"957593196"}]

[37][14:08:36.584]
[{"name":"Mylonas","SerialNumber":"957593166"}]
...

```

How can I get this information from these three fields in two lines? Is there any pattern in grok for this?

---

<div class="post-metadata">

**Author:** ![Vinicius\_Mylonas](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vinicius_mylonas/32/95611_2.png) [@Vinicius\_Mylonas](https://discuss.elastic.co/u/Vinicius_Mylonas)\
**Post date:** [October 14, 2021, 5:30pm UTC](https://discuss.elastic.co/t/log4net-to-logstash/286250/2 "2021-10-14T17:30:39Z")

</div>

```auto
filter{
  grok {
    match => {
      "message" => ["\[%{NUMBER:threadId}\]\[%{GREEDYDATA:sourceTimestamp}\]"]
    }
    match => {
      "message" => ["\[%{GREEDYDATA:json_data}\]"]
    }
  }
  json{
    source => "json_data"
  }
}

```

---

<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:** [November 11, 2021, 5:30pm UTC](https://discuss.elastic.co/t/log4net-to-logstash/286250/3 "2021-11-11T17:30:46Z")

</div>

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