Pattern
/\[(ERROR|WARN|INFO|DEBUG|TRACE|FATAL)\]/
Sample text
[INFO] boot [WARN] retry [ERROR] failed [TRACE] detail plain lineTest this pattern in the editor
Log levels
Pull severity tokens from structured logs.
Related patterns
ISO dates
Find YYYY-MM-DD dates in logs and prose.
ISO date-time
ISO-8601 timestamps with optional timezone.
IPv4 addresses
Octet-bounded IPv4 matcher for log scraping.
IPv6 (simplified)
Common full and compressed IPv6 forms.
Apache log line
Host, time, and request from a Combined log line.
HTTP status codes
Three-digit status codes in access logs.