坦桑尼亚电话号码：格式、区号和验证指南

const validateTanzanianNumber = (phoneNumber) => {
  // Remove any spaces or special characters. This ensures consistency regardless of user input format.
  const cleanNumber = phoneNumber.replace(/\D/g, '');

  // Patterns for different number types using regular expressions.
  const patterns = {
    geographic: /^2[2-8]\d{7}$/,
    mobile: /^(?:6[125-9]|7[13-9])\d{7}$/,
    tollFree: /^80[08]\d{6}$/,
    premium: /^90\d{7}$/,
    sharedCost: /^(?:840|86[01])\d{6}$/,
    emergency: /^(?:11[12]|999)$/ // Added emergency numbers
  };

  // Check if the number matches any valid pattern.
  return Object.values(patterns).some(pattern => pattern.test(cleanNumber));
};

// Example usage:  Test with various valid and invalid numbers.
console.log(validateTanzanianNumber("+255711234567")); // true - Valid mobile number
console.log(validateTanzanianNumber("221234567")); // true - Valid geographic number (national format)
console.log(validateTanzanianNumber("00255711234567")); // true - Valid mobile number (international format with double zero prefix)
console.log(validateTanzanianNumber("+2551234567890")); // false - Invalid number (too many digits)
console.log(validateTanzanianNumber("123")); // false - Invalid number (too few digits)

import re

def validate_tanzania_number(phone_number: str) -> tuple[bool, str]:
    """
    Validates Tanzanian phone numbers and identifies their type.

    Args:
        phone_number (str): Phone number to validate

    Returns:
        tuple[bool, str]: (is_valid, number_type)
    """
    patterns = {
        'geographic': r'^2[2-8]\d{7}$',
        'mobile': r'^(?:6[125-9]|7[13-9])\d{7}$',
        'toll_free': r'^80[08]\d{6}$',
        'premium': r'^90\d{7}$',
        'shared_cost': r'^(?:840|86[01])\d{6}$',
        'emergency': r'^(?:11[12]|999)$'
    }

    # Standardize input format.  Handles variations in prefixes and spacing.
    cleaned_number = phone_number.replace('+255', '').replace(' ', '').strip()
    if cleaned_number.startswith('0'):
        cleaned_number = cleaned_number[1:]

    # Validate against patterns.
    for number_type, pattern in patterns.items():
        if re.match(pattern, cleaned_number):
            return True, number_type

    return False, None


# Example usage: Test with various valid and invalid numbers.
print(validate_tanzania_number("+255651234567"))  # Output: (True, 'mobile')
print(validate_tanzania_number("0757123456"))  # Output: (True, 'mobile')
print(validate_tanzania_number("800123456"))  # Output: (True, 'toll_free')
print(validate_tanzania_number("invalid_number"))  # Output: (False, None)