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From: Chris Torek <torek@elf.torek.net>
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Subject: Re: [TUHS] RegExp decision for meta characters: Circumflex
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Also worth noting, though the precise history predates my own
experience: it's common in grammar theory to use `$` as the end
symbol.  Was this from REs using `$` as an end symbol as well,
or did REs adopt `$` from here, or ...?

Chris