Grep can be used for finding text within a file or output from previous command. You can use Regex with grep (or egrep), which I cover in this video.
Bash Regex Cheatsheet:
https://quidsup.net/images/grep.png
https://quidsup.net/svg/grep.svg
Background from Charlie Henson:
Beach And Nebula - https://www.opendesktop.org/p/1209392/
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