Australian Landline Number

Identifies Australian fixed-line telephone numbers across domestic bracketed, unbracketed, and international formats for area codes 02, 03, 07, and 08. Uses lookaround boundaries and supports hyphen separators within digit groups.

Type

regex

Engine

universal

Confidence

medium

Confidence justification

Medium confidence: area code prefix narrows scope but 10-digit sequences are common. Hyphen-separated formatting and corroborative keywords improve precision.

Detection quality

Verified

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

5

Platform compatibility

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

Pattern

(?<!\d)(?:\(0[2378]\)\s*\d{4}[\s\-]?\d{4}|0[2378][\s\-]?\d{4}[\s\-]?\d{4}|\+61\s?[2378]\s?\d{4}[\s\-]?\d{4})(?!\d)

Corroborative evidence keywords

fixed line, landline, desk phone, direct dial, DDI, PSTN, switchboard, reception, phone, mobile, contact, mob, cell, telephone, tel, ph, home phone, work phone, business phone, direct line (+6 more)

Proximity: 300 characters

Should match

• Fixed line: (02) 9876 5432 — Sydney landline with brackets
• Desk phone: 07 3456-7890 — Brisbane landline with hyphen separator
• DDI: +61 3 9876 5432 — Melbourne in international format
• PSTN: 08 8234 5678 — Adelaide plain format

Should not match

• 0912345678 — Area code 09 is not valid
• 02 1234 567 — Only 9 digits, too short
• +61 6 1234 5678 — Area code 6 is mobile/special, not fixed-line
• 1023456789 — Embedded in longer number

Known false positives

• 10-digit reference numbers or account codes with matching digit patterns. Mitigation: Lookaround boundaries and telecom keywords required for detection.