libphonenumber\PhoneNumberUtil::getValidPhoneNumberPattern PHP Method

getValidPhoneNumberPattern() protected static method

We append optionally the extension pattern to the end here, as a valid phone number may have an extension prefix appended, followed by 1 or more digits.
protected static getValidPhoneNumberPattern ( ) : string
return string
    protected static function getValidPhoneNumberPattern()
    {
        return static::$VALID_PHONE_NUMBER_PATTERN;
    }
PhoneNumberUtil