In the same vein, there is also Google's excellent libphonenumber for parsing, formatting, and validating international phone numbers. And because I had no ide

In the same vein, there is also Google's excellent libphonenumber for parsing, formatting, and validating international phone numbers. And because I had no idea before I worked on a project where we had to deal with customer data: many companies also use commercial services for address and phone number validation and normalization.