Australian Citizenship Certificate

Detects Australian Citizenship Certificate number patterns including prefixed formats (ACC, CDM, ACS, CAS followed by 4-8 digits) and numeric-only formats (0 + 10 digits).

Type

regex

Engine

universal

Confidence

medium

Confidence justification

Medium confidence: the 3-letter prefix (ACC, CDM, ACS, CAS) provides good structural specificity. Corroborative keywords are recommended to distinguish from other prefixed reference codes.

Jurisdictions

au

Regulations

AML/CTF Act (Cth), IPA 2009 (Qld), NDB Scheme (Cth), Privacy Act 1988 (Cth)

Frameworks

ISO 27001

Data categories

pii, government-id

Scope

narrow

Risk rating

3

Platform compatibility

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

Pattern

\b(?:ACC|CDM|ACS|CAS)\s?\d{4,8}\b

Corroborative evidence keywords

citizenship, citizenship certificate, Australian citizen, evidence number, stock number, naturalisation, naturalization, certificate of citizenship, immigration, Home Affairs, visa grant, visa subclass, ID number, identification, ID card, license, permit, registration, certificate

Proximity: 300 characters

Should match

• ACC12345678 — Low-tier probe - prefixed candidate without certificate context
• Citizenship certificate number: ACS56789 — Medium-tier probe - prefixed value with certificate context
• Department of Home Affairs Australian citizenship certificate: CDM 1234 — High-tier probe - certificate and issuing-department context
• Home Affairs citizenship certificate evidence number 01234567891 — High-tier numeric candidate with strong certificate and issuer context

Should not match

• XYZ12345 — Invalid prefix (XYZ instead of ACC/CDM/ACS/CAS)
• ACC123 — Too few digits after prefix (3 instead of 4-8)
• ACC123456789 — Too many digits after prefix (9 instead of 4-8)
• Template: Department of Home Affairs citizenship certificate ACC12345678 — Structurally complete but explicitly framed template content

Known false positives

• Common words and phrases related to australian citizenship certificate appearing in policy documents, training materials, HR templates, or compliance guidelines without actual personal data. Mitigation: Require corroborative evidence keywords within the proximity window to confirm sensitive data context rather than general discussion.
• In Australian English, 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.

Collections

• Australian Government IDs