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#58727
29.0.50; rx doc: Semantics of RX...
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Reported by: Michael Heerdegen <michael_heerdegen <at> web.de>
Date: Sun, 23 Oct 2022 02:33:02 UTC
Severity: normal
Found in version 29.0.50
Done: Michael Heerdegen <michael_heerdegen <at> web.de>
Bug is archived. No further changes may be made.
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> The resulting regexps are concatenating like with an implicit `seq'.
> This is not trivial, though: in stringish regexps the repetition
> operators are only unary, and different interpretations would make sense
> for `rx' (implicit `seq', implicit `or').
The rule is implicit concatenation unless specified otherwise; maybe we could say that in the leading paragraph. (`or` is the only place where concatenation isn't done.)
Otherwise I think we should grant our readers some common sense. It's not a formal specification but meant for humans to understand, and I'm quite sure they do.
> Oh, and maybe let's also make more clear that `rx' always cares about
> implicit grouping when necessary.
No, there is no such thing in rx. The manual provides corresponding string-notation constructs for orientation only.
This is important -- rx forms are defined by their semantics, not by what strings they translate to.
This bug report was last modified 2 years and 212 days ago.
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