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import re

def phone_validation(phone_number):

# Match a typical US phone number format (xxx) xxx-xxxx

pattern = re.compile(r'^\(\d{3}\) \d{3}-\d{4}$')

return bool(pattern.match(phone_number))

# Example usage:

phone_number_input = input("Enter phone number: ")

if phone_validation(phone_number_input):

print("Phone number is valid.")

else:

print("Invalid phone number.")

def email_validation(email):

# Basic email format validation

pattern = re.compile(r'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$')

return bool(pattern.match(email))

# Example usage:

email_input = input("Enter email address: ")

if email_validation(email_input):

print("Email address is valid.")

else:

print("Invalid email address.")

def password_validation(password):

# Password must be at least 8 characters long and contain at least one digit

return len(password) >= 8 and any(char.isdigit() for char in password)

# Example usage:

password_input = input("Enter password: ")

if password_validation(password_input):

print("Password is valid.")

else:

print("Invalid password.")

def username_validation(username):

# Allow only alphanumeric characters and underscores

return bool(re.match('^[a-zA-Z0-9_]+$', username))

# Example usage:

username_input = input("Enter username: ")

if username_validation(username_input):

print("Username is valid.")

else:

print("Invalid username.")

def country_validation(country):

# Example: Allow only alphabetical characters and spaces

return bool(re.match('^[a-zA-Z ]+$', country))

# Example usage:

country_input = input("Enter country name: ")

if country_validation(country_input):

print("Country name is valid.")

else:

print("Invalid country name.")