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Notes on regex dialect

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Tony Garnock-Jones 2021-10-04 14:29:39 +02:00
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@ -99,6 +99,17 @@ Filters: narrow down a selection without moving
dict
embedded
Design choice: Which regular expression dialect to choose? [CDDL (RFC
8610) goes for XML Schema regular
expressions](https://www.rfc-editor.org/rfc/rfc8610.html#section-3.8.3),
which seems like a very sensible choice. The discussion in section
3.8.3 of RFC 8610 makes some good points. A couple of things that
occurred to me: (1) the dialect should be backreference-free, allowing
matching by "[text-directed
engines](https://www.regular-expressions.info/engine.html)"; (2) it
should be very widely implemented; (3) it should cover regular
languages and no more; (4) it should be easy to implement.
## Transformers
e.g. stringify results; sequenceify results (see "+" operator); setify