How can I check if a string is a valid email address in Python using the validate-email-address library and regex with additional checks for specific email components?
Alex K

To check if a string is a valid email address in Python using thevalidate-email-address library and regex with additional checks for specific email components, you can follow these steps: 1. Install thevalidate-email-address library:

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   pip install validate-email-address

2. Import the necessary modules and classes:

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   import re
   from validate_email_address import validate_email

3. Define a function to check if the string is a valid email address with additional checks for specific email components:

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   def is_valid_email(email):
  if validate_email(email):
 # Perform additional validation using regex and specific checks
 regex_pattern = r'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$'
 if re.match(regex_pattern, email):
# Perform additional checks for specific email components
if '@example.com' in email:
    return False
# Add any other additional checks for specific email components as needed
return True
  return False

4. Call theis_valid_email function and pass the string to be checked:

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   email = "john.doe@example.com"
   if is_valid_email(email):
  print("Valid email address")
   else:
  print("Invalid email address")

In theis_valid_email function, thevalidate_email function from thevalidate-email-address library is used to validate the email format. If the email format is valid, the function proceeds with additional validation. A regular expression (regex_pattern) is constructed to validate the email format further. It allows for a typical email address format: a string of alphanumeric characters, dots, plus signs, hyphens, and underscores, followed by the '@' symbol, followed by a domain name consisting of alphanumeric characters and hyphens, followed by a dot and a top-level domain. The function then performs additional checks for specific email components. In the example, the function checks if the email address contains the domain '@example.com' using thein operator. You can add more checks for any other specific components or constraints that you require. If the email passes both the format validation, the additional regex pattern matching, and the checks for specific email components, the function returnsTrue, indicating that the email address is valid. Otherwise, it returnsFalse. You can modify the code to include any additional checks or handle specific requirements for email validation. Use theis_valid_email function to check if a string is a valid email address, considering both thevalidate-email-address library and any additional validation rules for specific email components, in your Python programs.

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