Versions | v1.0 (td-agent3) | v0.12 (td-agent2)

regexp Parser Plugin

The regexp parser plugin parses logs by given regexp pattern. The regexp must have at least one named capture (?<NAME>PATTERN). If the regexp has a capture named time, this is configurable via time_key parameter, it is used as the time of the event. You can specify the time format using the time_format parameter.

  @type regexp
  expression /.../

Table of Contents


See Parse section configurations for common parameters.


type default version
regexp required parameter 1.2.0

Regular expression for matching logs.

expression is string type before 1.2.0.


type default version
bool false 0.14.2

Ignore case in matching. Use i option with expression.

Deprecated since 1.2.0. Use expression /pattern/i instead.


type default version
bool false 0.14.2

Build regular expression as a multline mode. . matches newline. See Ruby’s Regexp document Use m option with expression.

Deprecated since 1.2.0. Use expression /pattern/m instead.


  @type regexp
  expression /^\[(?<logtime>[^\]]*)\] (?<name>[^ ]*) (?<title>[^ ]*) (?<id>\d*)$/
  time_key logtime
  time_format %Y-%m-%d %H:%M:%S %z
  types id:integer

With this config:

[2013-02-28 12:00:00 +0900] alice engineer 1

This incoming log is parsed as:

1362020400 (22013-02-28 12:00:00 +0900)

  "name" : "alice",
  "title": "engineer",
  "id"   : 1


How to debug my regexp pattern?

fluentd-ui’s in_tail editor helps your regexp testing. Another way, Fluentular is a great website to test your regexp for Fluentd configuration.

NOTE: You may hit Application Error at Fluentular due to heroku free plan limitation. Retry a few hours later or use fluentd-ui instead.

Last updated: 2019-01-20 04:33:34 +0000

Versions | v1.0 (td-agent3) | v0.12 (td-agent2)

If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is a open source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.