How do I check if a value is a valid URL in Python using the validators library and regex with additional validation rules?
Antek N

To check if a value is a valid URL in Python using thevalidators library and regex with additional validation rules, you can follow these steps: 1. Install thevalidators library:

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   pip install validators

2. Import the necessary modules:

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   import re
   import validators

3. Define a function to check if the value is a valid URL:

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   def is_valid_url(url):
  # Perform basic URL validation using the validators library
  if not validators.url(url):
 return False

  # Additional validation rules using regex
  regex_pattern = r'^https?://(?:www\.)?[a-zA-Z0-9-]+\.[a-zA-Z]{2,}(?:/[^/#?]+)?(?:\?[^#]+)?(?:#[^\s]+)?$'
  if not re.match(regex_pattern, url):
 return False

  return True

4. Call theis_valid_url function and pass the value to be checked:

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   url = "https://www.example.com"
   if is_valid_url(url):
  print("Valid URL")
   else:
  print("Invalid URL")

In theis_valid_url function, thevalidators.url function is used to perform basic URL validation. It checks if the value provided is a valid URL according to general URL syntax. After the basic validation, the function uses a regular expression (regex_pattern) to apply additional validation rules. The regex pattern in this example allows URLs starting with either "http://" or "https://", followed by an optional "www." subdomain, then the domain name containing alphanumeric characters and hyphens. It also supports an optional path (/[^/#?]+), query string (\?[^#]+), and fragment identifier (#[^\s]+). The pattern ensures that the URL adheres to a specific structure and format. If the value passes both the basic validation usingvalidators.url and the additional validation using the regex pattern, the function returnsTrue, indicating that the value is a valid URL. Otherwise, it returnsFalse. You can modify the code to include any additional validation rules or modify the regex pattern to suit your specific requirements. Use theis_valid_url function to check if a value is a valid URL in your Python programs.

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