Bank routing numbers

Detects references to bank routing numbers in financial and compliance documents. Commonly found in Australian regulatory filings, transaction records, and audit documentation.

Type: regex
Engine: boost_regex
Confidence: medium
Confidence justification: identifier/document-structure anchored regex with constrained context replaces phrase-only detection. Added context gating and exclusion rules improve precision and reduce incidental matches.
Detection quality: Mixed
Jurisdictions: au
Regulations: AML/CTF Act (Cth), IPA 2009 (Qld), NDB Scheme (Cth), Privacy Act 1988 (Cth), SOCI Act 2018 (Cth)
Frameworks: ISO 27001, ISO 27701, PCI-DSS, SOC 2
Data categories: financial
Scope: wide
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Compatible, Netskope: Unsupported

Pattern

\b\d{3}-\d{3}\b|\b(?:routing\s+number|ABA|RTN)\b[\s:#-]{0,20}\d{9}\b

Corroborative evidence keywords

bank routing numbers, bank, routing, numbers, financial, accounts, payments, bank account, account number, account no, BSB, routing number, sort code, IBAN, SWIFT, BIC, file number, reference number, case number, record number (+19 more)

Proximity: 300 characters

Should match

062-000 — Australian BSB (3-3)
Routing number: 021000021 — Labelled US ABA routing number
BSB 083-004 — BSB with label

Should not match

12345 — Too short
1234567 — Not a routing format
template example placeholder — Template/sample text

Known false positives

Financial terminology appearing in published reports, accounting textbooks, regulatory guidance, or template documents without actual transaction data. Mitigation: Require corroborative evidence keywords within the proximity window. Cross-reference with structured financial identifiers to confirm actual sensitive data.
In Australian English, standard business terminology overlapping with financial detection keywords in routine correspondence and documentation. Mitigation: Increase confidence threshold when scanning business correspondence. Layer with transaction-specific patterns for higher precision.