how to check phone number format is valid or not from telephony manager?

Question

For checking the phone number(I have the pattern phone number like +918172014908) validation I use libphonenumber.jar file.. It checks the phone number according to the country is valid or not. I use this:--

 PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance(); 
         PhoneNumber numberProto = phoneUtil.parse("phone_number", "");  
        phoneUtil.isValidNumber(numberProto) == true ? "valid" : "phone no not valid"

Its working fine..But this jar file takes a bit of memory.. Is there another way for checking the phone number format validation without libphonenumber.jar??? can you suggests something???

Answer 1

This answer might help you: https://stackoverflow.com/a/5959341

To validate a string, use

if (setNum.matches(regexStr))
where regexStr can be:

//matches numbers only
String regexStr = "^[0-9]*$"

//matches 10-digit numbers only
String regexStr = "^[0-9]{10}$"

//matches numbers and dashes, any order really.
String regexStr = "^[0-9\\-]*$"

//matches 9999999999, 1-999-999-9999 and 999-999-9999
String regexStr = "^(1\\-)?[0-9]{3}\\-?[0-9]{3}\\-?[0-9]{4}$" 

There's a very long regex to validate phones in the US (7 to 10 digits, extensions allowed, etc.). The source is from this answer: A comprehensive regex for phone number validation

String regexStr = "^(?:(?:\\+?1\\s*(?:[.-]\\s*)?)?(?:\\(\\s*([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9])\\s*\\)|([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]))\\s*(?:[.-]\\s*)?)?([2-9]1[02-9]|[2-9][02-9]1|[2-9][02-9]{2})\\s*(?:[.-]\\s*)?([0-9]{4})(?:\\s*(?:#|x\\.?|ext\\.?|extension)\\s*(\\d+))?$"