ex_regon v0.1.0 ExRegon View Source

Library for REGON number.

More about REGON number:

Link to this section Summary

Functions

Is REGON number valid?

Link to this section Functions

Link to this function valid?(regon) View Source
valid?(String.t()) :: boolean()

Is REGON number valid?

REGON is valid when:

  • length of it is 9 digits
  • and last digit is proper checksum for first eight digits
  • or
  • length of it is 14 digits
  • and last digit is proper checksum for first thirteen digits
  • and nine digit is proper checksum for first eight digits (coz 0 in mask)

For example:

iex> ExRegon.valid?("390170518")
true

iex> ExRegon.valid?("859222088")
false

iex> ExRegon.valid?("39017051841250")
true

iex> ExRegon.valid?("39016051841250")
false

iex> ExRegon.valid?("123")
false

iex> ExRegon.valid?("1223233321212121212121212")
false

iex> ExRegon.valid?("some really bad data")
false