เลขประจำตัวประชาชน

Detects เลขประจำตัวประชาชน 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

high

Confidence justification

High confidence: pattern has strong structural constraints (specific format, prefix, or character class restrictions) that significantly reduce false positive rates.

Detection quality

Verified

Jurisdictions

th

Regulations

PDPA (TH)

Frameworks

ISO 27001, ISO 27701

Data categories

pii, government-id

Scope

narrow

Risk rating

9

Platform compatibility

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

Pattern

\b\d-\d{4}-\d{5}-\d{2}-\d\b

Corroborative evidence keywords

เลขประจำตัว, population ID, citizen ID, บัตรประชาชน, ID number, identification, ID card, license, permit, registration, certificate

Proximity: 300 characters

Should match

• 1-1234-56789-01-2 — Thai ID with standard format
• 3-9876-54321-09-8 — Another Thai ID
• 5-4567-89012-34-5 — Valid Thai ID format

Should not match

• 1-123-56789-01-2 — Too few digits in second group
• 1-1234-5678-01-2 — Too few digits in third group

Known false positives

• The distinctive dash-separated format (X-XXXX-XXXXX-XX-X) is highly specific and rarely matches non-identity data. Mitigation: The structured format provides excellent inherent validation with very low false positive rates.
• 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

• Thai Population Identification Code entity definition - Microsoft Learn