Logsflags: g

Log Level

Matches standard log level keywords in log lines.

Try it in RegexPro →

Available in

JSSupported

JavaScript / ECMAScript

Browser-native RegExp. Default if you don't pick.

PYSupported

Python (re)

CPython stdlib `re`. Unicode-aware `\w` and `\d` by default.

GOSupported

Go (RE2)

Linear-time matching. No backreferences or lookarounds.

Pattern

regexengine-agnostic
\b(TRACE|DEBUG|INFO|WARN|ERROR|FATAL)\b   (flags: g)

Raw source: \b(TRACE|DEBUG|INFO|WARN|ERROR|FATAL)\b

How it works

`\b(TRACE|DEBUG|INFO|WARN|ERROR|FATAL)\b` matches any of the six standard log levels as whole words.

Examples

Input

[INFO] Server started. [ERROR] Connection failed.

Matches

  • INFO
  • ERROR

Input

DEBUG: cache miss

Matches

  • DEBUG

Common use cases

  • •Log filtering
  • •Alerting
  • •Error triage

Related patterns

Nginx Error Log

Logs

Parses Nginx error log lines.

Apache Common Log Format

Logs

Parses Apache Common Log Format entries.

CloudWatch Log Stream Path

Logs

Match AWS CloudWatch log group / stream paths like `/aws/lambda/my-function` or `/aws/ecs/cluster-name`.

JSON Log Line (Single-Line Object)

Logs

Match a single-line JSON object — typical of structured logging from services like slog, Bunyan, or Pino.

Related concepts

Alternation with the | Operator

Concept

The pipe | matches either the expression on its left or on its right. Combine with groups to alternate over a subpattern.

How to Match Multiple Patterns (Alternation)

How-to

Combine patterns with | to match either option. Wrap alternatives in a group to scope the alternation correctly.

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