I am writing a REGEX for social secuirty number. I want to combine the two regex so that social security number can be accepted like so:
123456789
123-45-6789
After searching other post on the internet, I came up with something like so:
Regex regx = new Regex("^\\d{9}$");
Regex regx2 = new Regex("^\\d{3}-\\d{2}-\\d{4}$");
Can I combine them together so that if the user enters 12345678 or 123-45-6789. they both will be valid.
any help will be appreciated.
If you can really only admit one or the other SSN version, then I would just combine your two regex patterns using an alternation:
^(?:\d{9}|\d{3}-\d{2}-\d{4})$
You can use ?s to make the -s optional (you can read more about it here, https://www.regular-expressions.info/optional.html). You can then use a backreference for the first -. (-?) creates the backrefernce and \\1 is its usage.
^\\d{3}(-?)\\d{2}\\1\\d{4}$
You can combine the regex as pattern bellow, if you wants one or other:
^\\d{3}(\\d{6}|-\\d{2}-\\d{4})$