Brazil CNH Number

Detects Brazilian driver licence numbers (CNH - Carteira Nacional de Habilitação). The CNH register number is 11 digits. Structural detection alone is ambiguous with CPF length, so corroborative CNH keywords are required for reliable use.

Type

regex

Engine

boost_regex

Confidence

medium

Confidence justification

Medium confidence: same length as CPF; keyword gating is mandatory to avoid systematic collision with br-cpf.

Jurisdictions

br

Regulations

LGPD, CTB (Brazil)

Frameworks

ISO 27001, ISO 27701

Data categories

pii, government-id

Scope

narrow

Risk rating

7

Platform compatibility

Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Compatible, Netskope: Compatible

Pattern

\b\d{11}\b

Corroborative evidence keywords

CNH, carteira de motorista, habilitação, registro CNH, ID number, identification, ID card, license, permit, registration, certificate

Proximity: 300 characters

Should match

• 12345678901 — 11-digit CNH register number
• 09876543211 — Alternate 11-digit value
• 11144477735 — Third illustrative value

Should not match

• 1234567890 — Only 10 digits
• 123456789012 — 12 digits
• 1234567890A — Contains a letter

Known false positives

• CPF is also 11 digits and will match the same digit pattern. Mitigation: Require CNH/habilitação keywords; deploy alongside br-cpf with distinct evidence.

References

• Brazilian traffic authority portal

Collections

• Coverage Phase 1 Priority Identifiers