regex | Grafana Labs
https://grafana.com/docs/loki/latest/clients/promtail/stages/regexregex stage. The regex stage is a parsing stage that parses a log line using a regular expression. Named capture groups in the regex support adding data into the extracted map. Schema regex: # The RE2 regular expression. Each capture group must be named. expression: <string> # Name from extracted data to parse. If empty, uses the log message.