Module 3 challenge: Work with Regular Expressions :Using Python to Interact with the Operating System (Google IT Automation with Python Professional Certificate) Answers 2025

1. Regular expression
✔️ A sequence of characters that forms a search pattern
❌ A method of encrypting data
❌ A function in Python for handling exceptions
❌ A type of data structure in Python

2. re.split() function
✔️ Splits a string into a list of substrings based on a regular expression pattern
❌ Checks for substring
❌ Concatenates strings
❌ Removes occurrences

3. Extract URLs with regex
✔️ pattern = r'https://\S+?\.\w+'
✔️ result = re.findall(pattern, website)
❌ Other methods

4. Split sentences including punctuation
✔️ pattern = r'\S+!? (or r'\S+|\S+?[\.\?!]')
✔️ result = re.findall(pattern, sentence)
❌ Other methods

5. Extract product IDs starting with 1
✔️ pattern = r'1\d{3}-[A-Z]{2}-\d{2}'
✔️ result = re.findall(pattern, report)
❌ Other methods

6. Role of replace_domain()
✔️ To replace the old domain with the new domain in an email address
❌ Iterate over list
❌ Write CSV
❌ Read CSV

7. Initializing old_domain_email_list
✔️ Step 1: Initialized list. Step 2: Used for loop to check each email with contains_domain() regex. Step 3: Appended emails with old domain.
❌ Manual inspection
❌ Using list comprehension
❌ Using regex only

8. Why close() method
✔️ To free up system resources and prevent further reading or writing to the file
❌ Ensure file remains open
❌ Encrypt file
❌ Delete file

9. Key benefit of Python + regex for reports
✔️ To automate repetitive tasks and data analysis
❌ Develop VR
❌ Enhance cybersecurity
❌ Optimize website

10. Purpose of contains_domain() function
✔️ To check if an email address belongs to a specific domain, using regular expressions (regex)
❌ Encrypt emails
❌ Add new domain
❌ Count emails

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📌 Summary Table