Regular expression to match US phone numbers

Question

The regular expression ^((\\(\\d{3}\\) ?)|(\\d{3}-))?\\d{3}-\\d{4}$ matches strings of the form XXX-XXX-XXXX and XXX-XXXX (am I missin

Answer 1

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

this will work.