India GST Number

Detects India GST Number patterns. This pattern is based on a Microsoft Purview built-in sensitive information type. Due to the numeric format, corroborative evidence keywords are essential for reliable detection.

Type: regex
Engine: universal
Confidence: high
Confidence justification: High confidence: the GSTIN format with 2-digit state code, 5-letter PAN, and structured suffix is highly distinctive and unlikely to appear in non-GST contexts. Added context gating and exclusion rules improve precision and reduce incidental matches.
Detection quality: Verified
Jurisdictions: in
Regulations: DPDPA, IT Act 2000 (India)
Frameworks: ISO 27001, ISO 27701, PCI-DSS, SOC 2
Data categories: financial, business-identifier
Scope: narrow
Risk rating: 7
Platform compatibility: Purview: Compatible, GCP DLP: Compatible, Macie: Compatible, Zscaler: Compatible, Palo Alto: Compatible, Netskope: Compatible

Pattern

\b\d{2}[A-Z]{5}\d{4}[A-Z]\d[A-Z0-9][A-Z0-9]\b

Corroborative evidence keywords

GST, GSTIN, goods and services tax, tax invoice, GST registration, GST filing, GST identification, GST number, GST return, input tax credit, state code, tax identification number, field, column, row, entry, record, value, form, register (+21 more)

Proximity: 300 characters

Should match

22AAAAA0000A1Z5 — Standard 15-character GSTIN format
07BBBBB1234B1ZA — GSTIN with state code 07
29CCCCC5678C1Z3 — GSTIN with state code 29

Should not match

22AAAA0000A1Z5 — Only 4 letters in PAN section, invalid GSTIN
AAAAAAA0000A1Z5 — No leading state code digits, invalid format
template example placeholder record identifier — Template/sample context should be excluded even when anchor words are present

Known false positives

Generic numeric sequences in non-tax contexts such as reference numbers or account identifiers Mitigation: Require corroborative evidence keywords within the proximity window to distinguish tax identifiers from general numeric data.
Numbers from other identification schemes with similar digit patterns Mitigation: Layer with jurisdiction-specific detection to prioritise matches in tax-related documents and cross-reference with other identifier types.

References

India GST Number entity definition - Microsoft Learn