EU National Identification Number

Detects references to EU National Identification Number using keyword matching. 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

eu

Regulations

GDPR

Frameworks

ISO 27001, ISO 27701

Data categories

pii, government-id

Scope

wide

Risk rating

9

Platform compatibility

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

Pattern

(?i)\b(?:national\s+identification\s+number|personalausweis|carte\s+nationale|documento\s+nacional\s+de\s+identidad|identity\s+card\s+number)\b

Corroborative evidence keywords

national identification, identity number, national ID, personalausweis, carte nationale, ID number, identification, ID card, license, permit, registration, certificate, data record, database record, record set, data extract, data export, database table, spreadsheet, data registry (+15 more)

Proximity: 300 characters

Should match

• national identification number — English keyword match
• personalausweis — German keyword match
• carte nationale d'identité — French keyword match

Should not match

• employee badge number — Non-identity reference
• serial number — Generic number reference
• template example placeholder record identifier — Template/sample context should be excluded even when anchor words are present

Known false positives

• Broad keyword matching across EU languages may match general policy discussion, training materials, or compliance documentation. Mitigation: Layer with additional contextual signals such as structured identifiers or form fields to distinguish actual data from policy references.
• In multiple languages, similar terminology used in formal or administrative contexts (education, professional documentation) that does not constitute sensitive data collection. Mitigation: Layer with additional contextual signals such as structured identifiers, form fields, or database column headers to distinguish sensitive records from general references.

References

• EU National Identification Number entity definition - Microsoft Learn