Bulgaria Driver's License Number

Detects Bulgaria 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.

Detection quality

Verified

Jurisdictions

bg, 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\d{9}\b

Corroborative evidence keywords

driver, licence, license, driving, DL, ID number, identification, ID card, permit, registration, certificate

Proximity: 300 characters

Should match

• 123456789 — Standard 9-digit Bulgarian driver's license number
• 987654321 — Another valid 9-digit format
• 012345678 — 9-digit number with leading zero

Should not match

• 12345678 — Too few digits (8 instead of 9)
• 1234567890 — Too many digits (10 instead of 9)

Known false positives

• Generic numeric 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

• Bulgaria driver's license number entity definition - Microsoft Learn