Data Cleaning and Experimenting Resources
A free, open source, powerful tool for working with messy data: cleaning it; transforming it from one format into another; and extending it with web services and external data.
Regular expressions are a concise and flexible tool for describing patterns in strings. These are online tools for experimenting and testing with regex: https://regexr.com/ and https://regex101.com/. This is a useful tutorial for historians.