Regex Generator

Log Line Validator

Validate if a given string is a log line using a regular expression


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Prompt

2020-03-12T13:34:56.123Z INFO  [org.example.Class]: This is a #simple #logline

Answer

The regular expression to validate the given log line is ^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z\sINFO\s\[\w+\.\w+\]:\s.*$.

Explanation:

  • ^ and $ match the start and end of the string respectively, ensuring the whole string is matched.
  • \d{4}-\d{2}-\d{2} matches the date in the format YYYY-MM-DD.
  • T matches the literal character 'T'.
  • \d{2}:\d{2}:\d{2}\.\d{3} matches the time in the format HH:MM:SS.SSS.
  • Z matches the literal character 'Z'.
  • \s matches a whitespace character.
  • INFO matches the literal string 'INFO'.
  • \[\w+\.\w+\] matches a tag in the format [org.example.Class].
  • : matches the literal character ':'.
  • \s matches a whitespace character.
  • .* matches any characters.
  • This regular expression assumes that the string only contains the given log line.

Language: Regular Expression.

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Description

This tool named "Log Line Validator" is designed to check if a given string follows a specific log line format by using a regular expression. The regular expression is ^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z\sINFO\s\[\w+\.\w+\]:\s.*$. It checks if the string matches the format of a log line, which includes a date, time, log level, tag, and log message. If the string matches the regular expression, it is considered a valid log line. This tool can be used to ensure that log lines are properly formatted in a system or application.

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