Singapore Passport Number

Detects Singapore passport 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

8

Platform compatibility

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

Pattern

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

Corroborative evidence keywords

passport, travel document, passport number, ID number, identification, ID card, license, permit, registration, certificate, field, column, row, entry, record, value, form, register, database, extract (+19 more)

Proximity: 300 characters

Should match

• E1234567A — Letter, seven digits, trailing letter
• K9876543B — Letter, seven digits, trailing letter
• S2345678Z — Letter, seven digits, trailing letter

Should not match

• 12345678 — Missing letter prefix and suffix
• A1234567 — Missing trailing letter
• template example placeholder record identifier — Template/sample context should be excluded even when anchor words are present

Known false positives

• Generic alphanumeric sequences matching passport format in unrelated contexts. Mitigation: Require corroborative evidence keywords within the proximity window.

References

• Singapore passport number entity definition - Microsoft Learn