Australian Mobile Number

Identifies Australian mobile telephone numbers in domestic (04XX) and international (+614XX) notation. Uses lookaround boundaries to prevent embedded numeric matches. Supports space-only separation between digit groups for high precision.

Type: regex
Engine: universal
Confidence: medium
Confidence justification: Medium confidence: the 04 prefix is Australian-mobile-specific but 10-digit numeric sequences occur in other contexts. Lookaround boundaries reduce false positives from embedded numbers. Corroborative keywords elevate confidence.
Jurisdictions: au
Regulations: AML/CTF Act (Cth), HRIPA (Cth), IPA 2009 (Qld), My Health Records Act 2012 (Cth), NDB Scheme (Cth), Privacy Act 1988 (Cth), TIA Act 1979 (Cth)
Frameworks: ISO 27001, ISO 27701
Data categories: pii, contact-information
Scope: narrow
Risk rating: 3
Platform compatibility: Purview: Compatible, GCP DLP: Unsupported, Macie: Unsupported, Zscaler: Compatible, Palo Alto: Unsupported, Netskope: Unsupported

Pattern

(?<!\d)(?:04\s?\d{2}\s?\d{3}\s?\d{3}|\+61\s?4\d{2}\s?\d{3}\s?\d{3})(?!\d)

Corroborative evidence keywords

cellular, handset, subscriber, wireless number, SMS contact, text number, personal details, customer record, client file, account holder, phone, mobile, contact, mob, cell, telephone, tel, ph, landline, home phone (+9 more)

Proximity: 300 characters

Should match

0412 345 678 — Low-tier probe - domestic mobile structure without context
Phone: +61 412 345 678 — Medium-tier probe - international mobile structure with generic phone context
Customer record - mobile number: 0498 765 432 — High-tier probe - mobile-specific label in an independent customer-record context
SMS contact: 0400 000 111 — Medium-tier mobile label without independent record context

Should not match

10412345678 — Embedded in longer number — leading digit prevents match
0512345678 — Prefix 05 is not a valid Australian mobile prefix
041 234 56 — Only 8 digits after prefix, too short
+61 3 9876 5432 — International landline prefix (+61 3) is not a mobile (+61 4) number
Documentation example: customer record mobile number 0412 345 678 — Structurally complete but explicitly documented example must not enforce

Known false positives

10-digit sequences starting with 04 in reference numbers or dates. Mitigation: Lookaround boundaries prevent embedded matches. Corroborative keywords required.