[thelist] RegExp 1 or 2 digits

[Tab Alleman]

I want to create a RegExp pattern that will match this:

"FOR xx NIGHTS"

...where xx could be either a 1 or 2 digit number.  There would not be a
leading zero if it's one digit.  

I'm not sure if doing a multiple instance of a range is acceptable
though.  I mean,

[0-9]+

Might match to "11" but would it match to "12", or is it even legal at
all?

Is there a way to do what I want?  I can't tell from the Special
Character libraries I've found.