"""
Validation utility functions
"""
import re

def validate_email(email):
    """Validate email format"""
    pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
    return re.match(pattern, email) is not None

def validate_password(password):
    """
    Validate password strength
    Returns: (is_valid, error_message)
    """
    if len(password) < 8:
        return False, "Password must be at least 8 characters long"
    if not re.search(r'[A-Z]', password):
        return False, "Password must contain at least one uppercase letter"
    if not re.search(r'[a-z]', password):
        return False, "Password must contain at least one lowercase letter"
    if not re.search(r'\d', password):
        return False, "Password must contain at least one digit"
    return True, None

def validate_phone(phone):
    """Validate phone number format"""
    # TODO: Implement phone validation
    pass