How do I check if a value is a valid email address in Python using the email-validator library and regex with additional validation rules?
Benjamin C

To check if a value is a valid email address in Python using theemail-validator library and regex with additional validation rules, you can follow these steps: 1. Install theemail-validator library:

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   pip install email-validator

2. Import the necessary modules and classes:

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   import re
   from email_validator import validate_email, EmailNotValidError

3. Define a function to check if the value is a valid email address with additional validation rules:

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   def is_valid_email(email):
  try:
 # Validate the email format using the email_validator library
 validate_email(email)
   
 # Perform additional validation using regex
 regex_pattern = r'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$'
 if not re.match(regex_pattern, email):
return False
   
 # Additional validation rules...
 # Add any additional validation rules as per your requirements.
   
 return True
   
  except EmailNotValidError:
 return False

4. Call theis_valid_email function and pass the value 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 theemail_validator library is used to validate the email format. If the email format is invalid, the function catches theEmailNotValidError exception and returnsFalse. After validating the email format, additional validation is performed using a regular expression (regex_pattern). The pattern 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. You can customize the regex pattern to include any additional validation rules or constraints that you require for the email address validation. Note: Theemail-validator library is already quite comprehensive in validating email addresses according to the RFC standards. Therefore, it is usually not necessary to add many additional validation rules. However, if you have specific requirements or constraints beyond the standard format, you can add them as additional validation rules within theis_valid_email function. Use theis_valid_email function to check if a value is a valid email address in your Python programs, considering both the email-validator library and any additional validation rules you have specified.

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