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About this tool
Validation regex for PAN, GSTIN, IFSC, UPI ID, PIN code, vehicle numbers and Aadhaar format, with live testing and honest caveats.
This library provides structure-checked regular expressions for the identifiers Indian applications validate every day: PAN (with the 4th-character holder-status rule), 15-character GSTIN with the 01–38 state-code range, RBI's 11-character IFSC, NPCI UPI IDs, 6-digit India Post PIN codes, standard and Bharat-series vehicle registrations, and the 12-digit Aadhaar shape. Every pattern has a live tester and states exactly what a regex cannot verify — checksums, issuance and active status.
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PAN's 4th letter is restricted to the 10 valid holder types and GSTIN's state code to 01–38 — most copied patterns skip both.
PAN, GSTIN and Aadhaar carry check characters no regex can compute; every pattern says so instead of implying verification.
Notes on masking and lawful collection accompany the Aadhaar pattern rather than treating it as just another string.
The common pattern is ^[A-Z]{5}[0-9]{4}[A-Z]$, but the stricter ^[A-Z]{3}[PCHFATBLJG][A-Z][0-9]{4}[A-Z]$ also enforces that the 4th character is a valid holder-status letter — P for individuals, C for companies, H for HUF, F for firms and so on. Neither can check the final character, which is a check letter, nor whether the PAN is actually issued.
A GSTIN is 15 characters: a 2-digit state code (01–38), the holder's 10-character PAN, an entity code of 1–9 or A–Z, the letter Z in position 14, and a checksum character — ^(0[1-9]|[1-2][0-9]|3[0-8])[A-Z]{5}[0-9]{4}[A-Z][1-9A-Z]Z[0-9A-Z]$ encodes all of that except the checksum value. Confirm active registration on the GST portal, since format-valid GSTINs can be cancelled or fake.
11 characters defined by RBI: a 4-letter bank code, the digit 0 reserved in the 5th position, and a 6-character alphanumeric branch code — regex ^[A-Z]{4}0[A-Z0-9]{6}$. For payments, still resolve the code against the RBI/NPCI branch directory because the regex cannot know whether the branch exists.
No — regex can only confirm the shape: 12 digits not starting with 0 or 1, optionally grouped 4-4-4, per ^[2-9][0-9]{3}[ -]?[0-9]{4}[ -]?[0-9]{4}$. The last digit is a Verhoeff checksum and real verification requires UIDAI's authentication services; also note Aadhaar is sensitive personal data that should only be collected with a lawful basis and stored masked.