Search code examples
regexregex-greedy

RUC Paraguayan validator

I want to make a validation for RUC from Paraguay.

Now I can validate this expression ^[0-9+#-]*$ and got this result 1234567-8, but I also have to validate this values:
1234567 -> only numbers
1234567A-8 -> number follows by a only one letter follow by -8.

Solution

  • You can use

    ^[0-9]+[A-Z]?(-[0-9])?$

    See the regex demo.

    Details:

    • ^ - string start
    • [0-9]+ - one or more digits
    • [A-Z]? - an optional uppercase ASCII letter
    • (-[0-9])? - an optional sequence of a - and a digit
    • $ - end of string.