Shell & RegEx

If you are on a Mac you can open the Terminal application and start experimenting. The current Mac OS uses the zshell as it's default shell, but almost everything you can do with a bash shell you can do with the zshell. If you are not on a Mac you have a few options. One option is to create a free account on Pythonanywhere which allows you to run a bash terminal session in the browser. Or you could create a Bash repl on replit. One option that doesn't require creating an account is here (the last of the console options should work fine on most computers).

Note that all of these might work slightly differently and some commands won't work at all.