@markgritter
I’m willing to bet & was chosen because ^ was unavailable in some common character set or configuration and would be mnemonic for “and” but for | meaning or…
Well shit now I’m nerdsniped. I was wondering if maybe it went back to Kleene with his original regex paper, but I just checked and it’s / there.
What’s interesting is that in Thompson’s regex paper, he uses | to mean or and doesn’t explain it, assuming the reader is already familiar.
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