REGON

Purpose

Use the regon detector for Polish business registry numbers (REGON - Rejestr Gospodarki Narodowej).

Detector Name

regon

Supported Formats

• 9 digits: NNNNNNNNN
• 14 digits: NNNNNNNNNNNNNN

FastPII validates both formats.

Validation Logic

1. Require exactly 9 or 14 digits.
2. Run the appropriate weighted Mod 11 checksum.

Checksum Algorithm (9-digit)

1. Multiply each digit by weights [8, 9, 2, 3, 4, 5, 6, 7].
2. Sum the products.
3. Take sum % 11.
4. If the result is 10, the checksum digit is 0. Otherwise, the result is the checksum digit.
5. Compare with the 9th digit.

Checksum Algorithm (14-digit)

1. Multiply each digit by weights [2, 4, 8, 5, 0, 9, 7, 3, 6, 1, 2, 4, 8].
2. Sum the products.
3. Take sum % 11.
4. If the result is 10, the checksum digit is 0. Otherwise, the result is the checksum digit.
5. Compare with the 14th digit.

Python Examples

from fastpii import FastPII, DEFAULT_PRIORITY
from fastpii.countries.pl import PolishPack

engine = FastPII(priority=DEFAULT_PRIORITY)
engine.register(PolishPack())
result = engine.detect("REGON: 123456785", detector_names=["regon"])

Validate a value directly

from fastpii import FastPII, DEFAULT_PRIORITY
from fastpii.countries.pl import PolishPack

engine = FastPII(priority=DEFAULT_PRIORITY)
engine.register(PolishPack())
result = engine.validate("123456785", "regon")

print(result.is_valid)

Detect in free text

from fastpii import FastPII, DEFAULT_PRIORITY
from fastpii.countries.pl import PolishPack

engine = FastPII(priority=DEFAULT_PRIORITY)
engine.register(PolishPack())
result = engine.detect("REGON: 123456785")

for finding in result.findings:
    print(finding.type, finding.value)

Limitations

• REGON is specific to Polish business registry numbers.
• The 9-digit and 14-digit formats have different checksum algorithms.