Japan Bank Account Number
Detects Japan Bank Account Number patterns. This pattern is based on a Microsoft Purview built-in sensitive information type. Financial account numbers require corroborative evidence for reliable detection due to their generic numeric format.
- Type
- regex
- Engine
- universal
- Confidence
- low
- Confidence justification
- Low confidence: seven-digit numbers are extremely common. Japanese banking keywords such as '口座番号' or '銀行' are essential for accurate detection. Context label evidence plus explicit template/example exclusion improves precision for high-risk identifiers. Added context gating and exclusion rules improve precision and reduce incidental matches.
- Detection quality
- Verified
- Jurisdictions
- jp
- Regulations
- APPI
- Frameworks
- ISO 27001, ISO 27701, PCI-DSS, SOC 2
- Data categories
- pii, financial
- Scope
- narrow
- Risk rating
- 9
- Platform compatibility
- Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Compatible, Netskope: Compatible
Pattern
\b\d{7}\bCorroborative evidence keywords
bank account, 口座番号, 銀行, 預金, 振込, account number, savings, bank account number, savings account, ACH, ANZ, ASB, banking, BNZ, checking, chequing, financial institution, Kiwibank, routing, Westpac (+49 more)
Proximity: 300 characters
Should match
1234567— Seven-digit Japanese bank account number9876543— Japanese bank account format1122334— Japanese banking account number
Should not match
123456— Six digits, too short for Japanese bank account12345678— Eight digits, exceeds Japanese bank account formatsample template placeholder number 123456789— Template/sample context should be excluded even when numeric-like values appeartemplate example placeholder record identifier— Template/sample context should be excluded even when anchor words are present
Known false positives
- Generic numeric sequences such as reference numbers, invoice numbers, or identifiers from other domains Mitigation: Require corroborative evidence keywords within the proximity window to distinguish financial account numbers from general numeric data.
- Phone numbers, postal codes, or other structured numbers with similar digit counts Mitigation: Layer with other detection patterns to deprioritise matches that overlap with phone number or postal code formats.