Portugal Driver's License Number

Detects Portugal driver's license number patterns. This pattern is based on a Microsoft Purview built-in sensitive information type. Users already running Purview may prefer to enable the built-in SIT directly, or use this version as a starting point for customisation.

Type: regex
Engine: universal
Confidence: medium
Confidence justification: Medium confidence: pattern has structural constraints but corroborative keywords are recommended to reduce false positive rates. Added context gating and exclusion rules improve precision and reduce incidental matches.
Detection quality: Mixed
Jurisdictions: pt, eu
Regulations: BDSG, CNIL / LIL, GDPR
Frameworks: ISO 27001, ISO 27701
Data categories: pii, government-id
Scope: narrow
Risk rating: 6
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Compatible, Netskope: Compatible

Pattern

\b[A-Z]{1,2}-\d{6,7}\b

Corroborative evidence keywords

driver, licence, license, driving, DL, carta de conducao, ID number, identification, ID card, permit, registration, certificate, field, column, row, entry, record, value, form, register (+21 more)

Proximity: 300 characters

Should match

A-123456 — Single letter prefix with 6-digit number
AB-1234567 — Two letter prefix with 7-digit number
X-9876543 — Single letter prefix with 7-digit number

Should not match

ABC-123456 — 3 letters instead of maximum 2
A-12345 — Too few digits (5 instead of minimum 6)
template example placeholder record identifier — Template/sample context should be excluded even when anchor words are present

Known false positives

Generic alphanumeric sequences matching the driver's license format appearing in unrelated contexts. Mitigation: Require corroborative evidence keywords within the proximity window to confirm driver's license context.

References

Portugal driver's license number entity definition - Microsoft Learn