IPv4 addresses

Octet-bounded IPv4 matcher for log scraping.

Pattern

/\b(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\b/

Connected 192.168.0.1
Gateway 10.0.0.1
Bad 999.999.999.999

Simple FQDN matcher for hostnames in prose.

Find YYYY-MM-DD dates in logs and prose.

ISO-8601 timestamps with optional timezone.

Common full and compressed IPv6 forms.

Colon or hyphen separated IEEE MAC addresses.

Pull severity tokens from structured logs.