# Log event with multi-line

**URL:** <https://discuss.elastic.co/t/log-event-with-multi-line/118207>\
**Category:** Logstash\
**Created:** [February 2, 2018, 10:06am UTC](https://discuss.elastic.co/t/log-event-with-multi-line/118207 "2018-02-02T10:06:41Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![shwesinhan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/shwesinhan/32/78663_2.png) [@shwesinhan](https://discuss.elastic.co/u/shwesinhan)\
**Post date:** [February 2, 2018, 10:06am UTC](https://discuss.elastic.co/t/log-event-with-multi-line/118207/1 "2018-02-02T10:06:41Z")

</div>

hi there,

may i ask about multi-line pattern matching in grok filter.  
in input part, i use tcp input plugin then grok in filter part.

eg:

```
2018-02-02 15:44:44,805 (null) 19 WARN : WEBFRORM: Somepage:: 342juajpobzxv4svu4jgt40v :: REQ: <PPRequest>
 <version>1.0</version>
 <timeStamp>020218154508</timeStamp>
 <iiid>444</iiid>
 <uniqueID></uniqueID>
 <inv>WS18020200002</inv>
 <processType>I</processType>
 <hashValue>4D83188885821DFEDB895B36E1A4DB2EF88D0608</hashValue>
 </PPRequest>
PPRequest: 27925660ms

```

when i grok this log event, i face \_grokparsefailure  
is there anyway to grok multi-line log event?

help! 😃

---

<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [February 2, 2018, 10:18am UTC](https://discuss.elastic.co/t/log-event-with-multi-line/118207/2 "2018-02-02T10:18:46Z")

</div>

Unless we know what your grok expression looks like we can't help.

---

<div class="post-metadata">

**Author:** ![shwesinhan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/shwesinhan/32/78663_2.png) [@shwesinhan](https://discuss.elastic.co/u/shwesinhan)\
**Post date:** [February 3, 2018, 1:13pm UTC](https://discuss.elastic.co/t/log-event-with-multi-line/118207/3 "2018-02-03T13:13:18Z")

</div>

this is my grok regex @magnusbaeck

```
if "<PPRequest>" in [message] {			
   grok {
		match => { "message" => ["^(?<log_timestamp>\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2},\d{1,3}).*?(?<threadno>\d+).*?%{WORD:log_level}.*?Somepage\s{0,}::\s+(?<session_id>.*?)\s{0,}::\s{0,}:REQ:.*?<iiid>(?<mid>.*?)</iiid>.*?<inv>(?<invoice_id>.*?)</inv>"]}
		add_field => { "log_type" => "PREQUEST" }
	}	
}
```

---

<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [February 4, 2018, 9:05pm UTC](https://discuss.elastic.co/t/log-event-with-multi-line/118207/4 "2018-02-04T21:05:00Z")

</div>

Try prepending your expression with `(?m)`. See example at [https://stackoverflow.com/a/28231905/414355](https://stackoverflow.com/a/28231905/414355).

---

<div class="post-metadata">

**Author:** ![shwesinhan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/shwesinhan/32/78663_2.png) [@shwesinhan](https://discuss.elastic.co/u/shwesinhan)\
**Post date:** [February 26, 2018, 6:10am UTC](https://discuss.elastic.co/t/log-event-with-multi-line/118207/5 "2018-02-26T06:10:28Z")

</div>

> [@magnusbaeck](#):
>
> (?m)

By using (?m) flag is only ok at [https://grokdebug.herokuapp.com/](https://grokdebug.herokuapp.com/)  
But when i use actual logstash conf, it doesn't work.

---

<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 26, 2018, 6:10am UTC](https://discuss.elastic.co/t/log-event-with-multi-line/118207/6 "2018-03-26T06:10:45Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.