Valid Phone Number.rb

=begin
Write a function that accepts a string, and returns true if it is in the form of a phone number.
Assume that any integer from 0-9 in any of the spots will produce a valid phone number.

Only worry about the following format:
(123) 456-7890 (don't forget the space after the close parentheses)

Examples:

validPhoneNumber("(123) 456-7890")  =>  returns true
validPhoneNumber("(1111)555 2345")  => returns false
validPhoneNumber("(098) 123 4567")  => returns false

#alternative solution - not mine

def validPhoneNumber(phoneNumber)
  !!phoneNumber[/\A\(\d{3}\)\s\d{3}-\d{4}\z/]
end


=end


def validPhoneNumber(phoneNumber)

   result = phoneNumber.gsub(/\D/, '')
   			.insert(0,"(")
		   	.insert(4,")")
		   	.insert(5," ")
		   	.insert(9,"-")
 
  result == phoneNumber ? true : false
 
 end