Uimhir PSP

Detects Uimhir PSP 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: eu, ie
Regulations: BDSG, CNIL / LIL, GDPR
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{7}[A-Z]{1,2}\b

Corroborative evidence keywords

PPS, personal public service, RSI, 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

1234567A — PPS number with single check letter
9876543AB — PPS number with two check letters
4567890W — Another PPS number format

Should not match

123456A — Too few digits (6)
1234567 — Missing check letter
template example placeholder record identifier — Template/sample context should be excluded even when anchor words are present

Known false positives

Seven digits followed by one or two letters may match postal codes, reference numbers, or product codes. Mitigation: Require corroborative evidence keywords such as "PPS" or "personal public service" within the proximity window.
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

Ireland Personal Public Service (PPS) Number entity definition - Microsoft Learn