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Regular expressions (regex) in Python are powerful tools for pattern matching in strings. They allow you to search for specific patterns within text, making them useful for tasks such as data validation, text cleaning, and data extraction. To use regex in Python, you need to import the re module, which provides various functions for working with regex.

Some important functions in the re module include:

re.search(): Finds the first match of a pattern in a string.
re.findall(): Returns all matches of a pattern in a string.
re.sub(): Replaces occurrences of a pattern in a string with a specified replacement.
re.split(): Splits a string based on a specified pattern.

For example, to find a North American phone number, you can create a regex pattern and use the search method to locate it within a string. Grouping can also be done using parentheses to capture specific parts of the match ¹²⁵.

If you have any specific questions or need examples, feel free to ask!

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