Question: how to match on end of string? about canopy HOT 4 CLOSED

Oh, I see what you mean. There is a way to match only if an expression appears at the end of the input, which is to use a negative look-ahead to check there is no character after the expression. So, expr !. matches expr only at the end of the input.

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(Sorry it took me so long to reply in the first place.)

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There isn't an explicit operator for matching the end of the string -- Canopy parsers implicitly match the entire input. If you give the parser some input and the parser doesn't reach the end of the input by following the grammar rules, then it will fail with an error.

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@jcoglan Thanks for the feedback. My work-around has been to append a space before parsing, that triggers a different rule and alleviates my need to identify an end_of_input.

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