Java phone number format API

You could write your own (for US phone # format):

• Strip any non-numeric characters from the string
• Check that the remaining string is ten characters long
• Put parentheses around the first three characters and a dash between the sixth and seventh character.
• Prepend "+1 " to the string

---

Update:

Google recently released libphonenumber for parsing, formatting, storing and validating international phone numbers.

Simple regex parser

/**
 * @param pPhoneNumber
 * @return true if the phone number is correct
 */
private boolean isPhoneNumberCorrect(String pPhoneNumber) {

    Pattern pattern = Pattern
            .compile("((\\+[1-9]{3,4}|0[1-9]{4}|00[1-9]{3})\\-?)?\\d{8,20}");
    Matcher matcher = pattern.matcher(pPhoneNumber);

    if (matcher.matches()) return true;


    return false;
}

Format

I made this according to my needs, and it accepts numbers:

1. CountryCode-Number
2. Number

Country Codes:

They may have a: +, or either one or two zeros. Then, it may be followed by a -.

Accepts:

• +456
• 00456
• +1234
• 01234

All above may or may not followed by a -

Rejects:

• 0456
  • it should be:
    • 00456 or+456 or04444

Number

A simple number with 8-20 digits.

Accepts:

• 00456-12345678
• +457-12345678
• +45712345678
• 0045712345678
• 99999999

Extend it?

Feel free, so you may include support for . or '(' separators. Just make sure you escape them, e.g. for ( use \(.

You could try this Java phone number formatting library https://github.com/googlei18n/libphonenumber

It has data for hundreds of countries and formats.