SSN Regex for 123-45-6789 OR XXX-XX-XXXX

Can someone provide me a regex for S开发者_如何学编程SN that matches either

123-45-6789

OR

XXX-XX-XXXX

I currently have ^\d{3}-?\d{2}-?\d{4}$ which matches the first expression, but I need to add the second expression to it as an alternative.

Thanks!

To strictly answer you question:

^(123-45-6789|XXX-XX-XXXX)$

should work. ;-)

If you read the section "Valid SSNs" on Wikipedia`s SSN article then it becomes clear that a regex for SSN validation is a bit more complicated.

Accordingly a little bit more accurate pure SSN regex would look like this:

^(?!(000|666|9))\d{3}-(?!00)\d{2}-(?!0000)\d{4}$

(^\d{3}-?\d{2}-?\d{4}$|^XXX-XX-XXXX$) should do it.

---- EDIT ----

As Joel points out you could also do ^(\d{3}-?\d{2}-?\d{4}|XXX-XX-XXXX)$ which is a little neater.

So you currently have: ^\d{3}-?\d{2}-?\d{4}$

What you need is to allow any of those numeric blocks to be "X"s instead. This is also fairly simple as a regex - just adapt your existing one to have X instead of \d in each of the three places it occurs: X{3}-?X{2}-?X{4}

You won't want to be combining a numeric code with and X code, so you just need to allow either one case or the other, so wrap them up in brackets and us a pipe character to specify one or the other, like so:

^((\d{3}-?\d{2}-?\d{4})|(X{3}-?X{2}-?X{4}))$

You'll probably also want to allow upper- or lower-case X. This can be specified using [Xx] or by making the whole thing case insensitive, using the i modifier outside the regex.

Then it can be

/^[\dX]{3}-?[\dX]{2}-?[\dX]{4}$/

if you want x to be valid too, you can add the i modifier to the end:

/^[\dX]{3}-?[\dX]{2}-?[\dX]{4}$/i

On second thought, the regex above will accept

123-xx-xxxx

as well, so depending on whether you want this form to be accepted or not, you can use your original form "or" the other form:

/^(\d{3}-?\d{2}-?\d{4})|(xxx-xx-xxxx)$/i

A more generic match would be:

(^[^-]{3}-?[^-]{3}-?[^-]{4}$)

This would match any sequence of characters other than "-" in 3-3-4 char configuration. For example:

my @str = qw/
  1adfasdfa
  adsfaouaosd90890
  111-232-adafd
  xXX-232-1234
  111-222-4444
  $$%-AF#-131@
/;

foreach(@str)
{
  print "$_\n" if /^[^-]{3}-?[^-]{3}-?[^-]{4}$/;
}

^\d{3}-?\d{2}-?\d{4}$|^XXX-XX-XXXX$