Regex is short for 'regular expressions'. It's quite complicated shit, but very powerful if you want to chop up some text files - which is what 90% of programming computers is. Manipulating character representations *is* being a programmer of computers.
I'm struggling to find a good intro that doesn't start in the middle!
Even learning them slightly is magic if your texteditor supports regexes for search and replace. Kate is a gui.

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