Singapore Driving License Number

Detects Singapore driving 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: Verified
Jurisdictions: sg
Regulations: PDPA (SG)
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

\bS\d{7}[A-Z]\b

Corroborative evidence keywords

driver, licence, license, driving, DL, ID number, identification, ID card, permit, registration, certificate, field, column, row, entry, record, value, form, register, database (+20 more)

Proximity: 300 characters

Should match

S1234567A — Standard Singapore driving license format
S9876543Z — Another valid format with different trailing letter
S0012345B — Valid format with leading zeros in digit portion

Should not match

T1234567A — Wrong leading letter (T instead of S)
S123456A — Too few digits (6 instead of 7)
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 driving license format appearing in unrelated contexts, particularly Singapore NRIC numbers which share a similar format. Mitigation: Require corroborative evidence keywords within the proximity window to confirm driving license context.