Logs

Nginx Error Log

Parses Nginx error log lines.

Available in

JavaScript / ECMAScript

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

Python (re)

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

Go (RE2)

Linear-time matching. No backreferences or lookarounds.

regexengine-agnostic

^(\d{4}/\d{2}/\d{2} \d{2}:\d{2}:\d{2}) \[(\w+)\] (\d+)#(\d+): (.*)$

Raw source: ^(\d{4}/\d{2}/\d{2} \d{2}:\d{2}:\d{2}) \[(\w+)\] (\d+)#(\d+): (.*)$

Captures timestamp, log level, PID, TID, and the error message from standard Nginx error log format.

Input

2023/10/11 10:00:00 [error] 1234#5678: *1 connect() failed

Matches

Matches standard log level keywords in log lines.

Parses Apache Common Log Format entries.

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

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