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bug#37849: composable character alternatives in rx
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From: |
Mattias Engdegård |
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Subject: |
bug#37849: composable character alternatives in rx |
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Date: |
Sun, 27 Oct 2019 10:17:40 +0100 |
Expansion inside (not ...) should be uncontroversial; now pushed (cbd439e785).
Character set operators (union, intersection, difference) would be useful.
Consider:
(rx-define ident-chars (any "a-zA-Z0-9"))
(rx-define operator-chars (any ?+ ?- ?* ?/ ?< ?> ?=))
There is then currently no way to form the set of characters that excludes both
the above sets.