Date of Birth

Detects date-of-birth references across common date formats (numeric slash/dot/hyphen, written month, ISO) when birth-record labels or personal-record context are present. Covers Australian and global document styles; business dates (invoice, due, expiry) and template samples are suppressed.

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

global

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

3

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., [object Object], 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 (+1 more)

Proximity: 300 characters

Should match

• 15/03/1990 — Exact 65 discovery probe - structured date without personal or birth-record context
• DOB: 15/03/1990 — Exact 75 probe - explicit birth-date label without broader personal-record context
• Personal details recorded on file - DOB: 15/03/1990 — Exact 85 probe - explicit birth-date label plus personal-record context
• 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: this quarter — Invoice date phrasing with no structured date value
• Due date: end of month — Payment due date phrasing with no structured date value
• unrelated generic text — No date pattern present
• Invoice date: 15/03/1990 — Structured business date is suppressed by the business-date document filter
• Sample template personal details: 15/03/1990 — Template text would satisfy personal context but is vetoed by the shared exclusion
• Passport expiry date: 15/03/2030 — Sibling identity-document date is suppressed by the expiry-date filter
• Published event date: 15/03/1990 — Public event date has no personal or birth context and remains discovery-only
• reference 12345 — Not a date (merged from companion SIT)
• see page 42 — Not a date (merged from companion SIT)
• not a date here — Plain prose (merged from companion SIT)

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