It's surprisingly more logical and straightforward than you might think. Just start small and work your way up. No doubt you already use wildcards when interact

It's surprisingly more logical and straightforward than you might think. Just start small and work your way up. No doubt you already use wildcards when interacting with the shell; now just add little bits of syntax as you go until you can match more complicated things. You don't have to go as far as pattern extraction and backreferencing and all that to make some good use of it.