Not sure about $ sign, but ^ probably comes from ADM-3A: https://en.wikipedia.or... | Hacker News

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		Lex-2008 on March 26, 2024 \| parent \| context \| favorite \| on: Why do regexes use `$` and `^` as line anchors? Not sure about $ sign, but ^ probably comes from ADM-3A: https://en.wikipedia.org/wiki/ADM-3A#Legacy And here is a photo of its keyboard: https://twitter.com/toresbe/status/1756800589340549609/photo...

em500 on March 26, 2024 [–]

Per the article, these anchors appear in Ken Thompson's port of the QED text editor which dates back to 1970, years before even the ADM-1 terminal.

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