Validate Mobile number using regular expression

Question

I need to validate mobile number. My need:

1. The number may start with +8801 or 8801 or 01
2. The next number can be 1 or 5 or 6 or 7 or

Answer 1

I know, that question was asked long time ago, but i assume that @G. M. Nazmul Hossain want to validate mobile number againt chosen country. I show you, how to do it with free library libphonenumber from Google. It's available for Java, C++ and Javascript, but there're also fork for PHP and, i believe, other languages.

+880 tells me that it's country code for Bangladesh. Let's try to validate example numbers with following code in Javascript:

String bdNumberStr = "8801711419556"
PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
try {
    //BD is default country code for Bangladesh (used for number without 880 at the begginning)
    PhoneNumber bdNumberProto = phoneUtil.parse(bdNumberStr, "BD");
} catch (NumberParseException e) {
    System.err.println("NumberParseException was thrown: " + e.toString());
}
boolean isValid = phoneUtil.isValidNumber(bdNumberProto); // returns true

That code will handle also numbers with spaces in it (for example "880 17 11 41 95 56"), or even with 00880 at the beggininng (+ is sometimes replaced with 00).

Try it out yourself on demo page. Validates all of provided examples and even more.