Phone validation regex

Question

I\'m using this pattern to check the validation of a phone number

^[0-9\\-\\+]{9,15}$

It\'s works for 0771234567 and +0

Answer 1

^(\+\d{1,2}\s)?\(?\d{3}\)?[\s.-]\d{3}[\s.-]\d{4}$

Matches the following cases:

123-456-7890

(123) 456-7890

123 456 7890

123.456.7890

+91 (123) 456-7890