Regular expressions (also called RE or regexes) are a tiny, specialized programming language which can be used to do pattern matching and extract parts of a string.

Example

If you have an address column that is formatted like this:

123 Cherry Road, Mobile, AL 36571
9 Main St, New York, NY 10022
3050 Hollywood Blvd, Los Angeles, CA 90210

Then you could extract the state abbreviation by searching for two uppercase letters followed by a space and five digits, like this

([A-Z][A-Z]) \d\d\d\d\d

[A-Z] means any uppercase letter, and \d means any digit. The parentheses specify which part of the matched string to extract into a new column.

⭐️ Resources

This very handy cheatsheets will get you started.
This tutorial will help you build great skill. 

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