What is the `re` module for regular expressions?

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**re** — regular expression operations for pattern matching. ```python import re # Search and match match = re.search(r"\d+", "There are 42 apples") print(match.group()) # 42 # Find all numbers = re.findall(r"\d+", "12 eggs and 34 apples") print(numbers) # ['12', '34'] # Groups match = re.search(r"(\w+)@(\w+)\.\w+", "user@example.com") print(match.group(1)) # user print(match.group(2)) # example # Named groups match = re.search(r"(?P\w+) (?P\d+)", "Alice 30") print(match.group("name")) # Alice # Compile for reuse pattern = re.compile(r"\b\w{4}\b") four_letter_words = pattern.findall("this is a test of words") # Substitution result = re.sub(r"\d+", "X", "Call 555-1234 now") print(result) # Call X-XXXX now # Split parts = re.split(r"[,;\s]+", "one, two; three four") print(parts) # ['one', 'two', 'three', 'four'] ``` **Tips:** - Use raw strings (r"..."). - Compile patterns used multiple times. - Use named groups for clarity.

Python: What is the `re` module for regular expressions?