Logsflags: g

Logfmt Key-Value Pair

Parse key=value pairs from logfmt-style log lines, supporting both quoted and unquoted values.

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
([a-zA-Z_][\w.]*)=("[^"]*"|\S+)   (flags: g)

Raw source: ([a-zA-Z_][\w.]*)=("[^"]*"|\S+)

How it works

([a-zA-Z_][\w.]*) captures the key: starts with a letter or underscore, followed by word chars or dots. = is a literal separator. ("[^"]*"|\S+) captures the value: either a double-quoted string (allowing spaces inside) or an unquoted sequence of non-whitespace characters.

Examples

Input

level=info msg="user logged in" user_id=42

Matches

  • level=info
  • msg="user logged in"
  • user_id=42

Input

ts=2024-01-15T14:30:00Z status=200 latency=12ms

Matches

  • ts=2024-01-15T14:30:00Z
  • status=200
  • latency=12ms

Common use cases

  • •Parsing logfmt output from Go services (standard library log/slog)
  • •Extracting structured fields from Heroku and Fly.io log drains
  • •Log aggregation pipelines (Vector, Fluentd, Filebeat)
  • •Building log dashboards from structured text logs
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