Australian Birth Date Indicator

Identifies date-of-birth references in Australian documents using multiple structural date regex patterns (numeric slash, numeric dot, written month, ISO format) combined with birth-record and personal-information keywords.

Type: regex
Engine: boost_regex
Confidence: medium
Confidence justification: Medium confidence: date formats are common in many contexts. Birth-record keywords are essential to distinguish DOB from invoice dates, event dates, and other temporal references.
Jurisdictions: au
Regulations: AML/CTF Act (Cth), IPA 2009 (Qld), NDB Scheme (Cth), Privacy Act 1988 (Cth)
Frameworks: ISO 27001
Data categories: government-id, pii
Scope: wide
Risk rating: 7
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Compatible, Netskope: Unsupported

Pattern

\b(?:(?:0?[1-9]|[12][0-9]|3[01])[\/\-\.](?:0?[1-9]|1[012])[\/\-\.](?:19|20)\d{2}|(?:0?[1-9]|[12][0-9]|3[01])(?:st|nd|rd|th)?\s+(?:Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|Jun(?:e)?|Jul(?:y)?|Aug(?:ust)?|Sep(?:tember)?|Oct(?:ober)?|Nov(?:ember)?|Dec(?:ember)?)\s+(?:19|20)\d{2}|(?:19|20)\d{2}[\-\/](?:0[1-9]|1[012])[\-\/](?:0[1-9]|[12]\d|3[01]))\b

Corroborative evidence keywords

DOB, date of birth, birth date, born, born on, birthday, d.o.b, d.o.b., DOB:, D.O.B, D.O.B., date of birth:, DateOfBirth, birthdate, Date of Birth (DD/MM/YYYY), DOB (required), Enter your date of birth, age, year of birth, birth year

Proximity: 300 characters

Should match

DOB: 15/03/1990 — Numeric slash format with DOB label
Born on 1st January 1985 — Written month format with ordinal
Date of birth: 25.12.2000 — Dot-separated format
Birth date: 1990-03-15 — ISO format

Should not match

Invoice date: 15/03/2024 — Date in non-DOB financial context
Due date: 01/01/2025 — Payment due date, not birth date
unrelated generic text — No date pattern present

Known false positives

Non-DOB dates such as invoice dates, event dates, and document timestamps. Mitigation: Require birth-record keywords in proximity. Personal-information context provides lower tier.

References

https://www.oaic.gov.au/privacy/your-privacy-rights/your-personal-information/what-is-personal-information