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Regex parser plugin for Embulk

A simple parser Using Regular Expression.

Overview

  • Plugin type: parser
  • Guess supported: yes

Configuration

  • regex: regular expression that must use Named Capturing Group (string, required)
  • columns: column definition (list of object)
    • regex_name: 'Named Capturing Group' can only include [a-zA-Z0-9], so alias group name in regex can be specified (string, default: <name> attr value)
  • skip_if_unmatch: if false, when a line don't match the regex, raise RuntimeException. If true, skip the line. (boolean, default: false)

Example

in:
  type: any file input plugin type
  parser:
    type: regex
    regex: ^(?<remoteHost>[.:0-9]+) (?<identity>\S+) (?<user>\S+) \[(?<datetime>[^\]]*)\] "((?<method>\S+) (?<path>\S+) (?<protocol>HTTP/\d+\.\d+)|-)" (?<status>[0-9]+) (?<size>[0-9]+|-) "(?<referer>[^"]*)" "(?<userAgent>[^"]*)" (?<inByte>[0-9]+) (?<outByte>[0-9]+)$
    columns:
    - {name: remote_host, type: string, regex_name: remoteHost}
    - {name: identity, type: string}
    - {name: user, type: string}
    - {name: datetime, type: timestamp, format: '%d/%b/%Y:%H:%M:%S %z'}
    - {name: method, type: string}
    - {name: path, type: string}
    - {name: protocol, type: string}
    - {name: status, type: long}
    - {name: size, type: long}
    - {name: referer, type: string}
    - {name: user_agent, type: string, regex_name: userAgent}
    - {name: in_byte, type: long, regex_name: inByte}
    - {name: out_byte, type: long, regex_name: outByte}

Guess

Some apache LogFormats can be guessed. After writing in: section, you can let embulk guess parser: section using this command:

$ embulk gem install embulk-parser-regex
$ embulk guess -g regex config.yml -o guessed.yml

Build

$ ./gradlew gem  # -t to watch change of files and rebuild continuously

Run checkstyle:

$ ./gradlew check

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