regex - validate a 10 digit USA style phone number using a Regular Expression in Javascript -

i want validate 10 digit usa style phone number using regular expression in javascript

it should allow (validate correct) following formats:

xxx-xxx-xxxx  215-121-1247 

it should reject invalid:

8059311142 805 931 42ab 105 931 4288 

i found regex implement below, can't work.

/^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/ 

please me on this

you can as:

^\d{3}-\d{3}-\d{4}$

demo: http://regex101.com/r/jv1hp3

to understand regex doing, check this link