Transform rule syntax clarifications

[Mark Davis ☕️ via CLDR-Users]

{phone}

On Sun, Nov 17, 2019, 02:38 Richard Wordingham via CLDR-Users <
cldr-users at unicode.org> wrote:

> On Sat, 16 Nov 2019 13:18:00 -0800
> Cameron Dutro via CLDR-Users <cldr-users at unicode.org> wrote:
>
> > The other bits of syntax you've mentioned are from the Unicode Set
> > specification, which you can find in UTS #35
> > <https://unicode.org/reports/tr35/#Unicode_Sets>. Unicode Sets are
> > like regex character classes, but as you've noticed, there are a
> > couple of special operations they support that regexes don't.
>

Some regrexes do

https://regular-expressions.mobi/charclasssubtract.html?wlr=1

> Specifically, the "-" operator is the symmetric difference
> > <https://en.wikipedia.org/wiki/Symmetric_difference> between the two
> > operands (UTS 35 says "asymmetric difference," but I don't think
> > that's a thing - I can't find any definition of it online).
>
> It very much is a thing!  In this particular case,
>
> $accent_minus = [[$accent]-[$iotasub$macron]];
>
> is probably the same as the symmetric difference, because from
> the names i think everything in the second set is in the first set, but
> this doesn't always apply.  [abcd] - [abef] is [cd], not the symmetric
> difference [cdef].
>

Also Unicodeset alternatives don't support backup.

>
> Richard.
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