Question

Can you help me write two rules that check phoneNumber?
First rule: start with +7 or 8 then any ten numbers.
Examples:

[phone] - valid
77017223457 -not valid
87017223457 - valid

Second rule: start with +7 or 8 then three numbers from set:
{700, 701, 702, 705, 707, 712, 713, 717, 718,721, 725, 726, 727, 777 } then any seven numbers.

Examples:

[phone] - valid
[phone] - not valid (no 703 in the set)

Thanks.

Answer 1

var phone = $("#phoneNumber").val()
var regex = /^((\+7)|8)(700|701|702|705|707|712|713|717|718,721|725|726|727|777)[0-9]{7}$/;
if(regex.test(phone))
   // Phone is valid
else
   // Phone is invalid