On 18 Sep 2013, at 21:05, Anne van Kesteren <[email protected]> wrote:
> On Mon, Aug 19, 2013 at 5:25 AM, Mathias Bynens <[email protected]> wrote: >> After comparing the output, I noticed that both regular expressions are >> identical except for the following: ECMAScript 5 allows U+2E2F VERTICAL >> TILDE in `IdentifierStart` and `IdentifierPart`, but ECMAScript 6 / Unicode >> TR31 doesn’t. > > Per ES6 identifiers start with code points whose category is ID_Start > which per http://www.unicode.org/reports/tr31/ includes Lm which per > http://www.unicode.org/Public/UNIDATA/UnicodeData.txt is true for > U+2E2F. So why exactly is it disallowed? `ID_Start` includes code points in the `Lm` category indeed, but then later explicitly disallows `Pattern_Syntax` and `Pattern_White_Space` code points. As it says on the page you linked to: > In set notation, this is > [[:L:][:Nl:]--[:Pattern_Syntax:]--[:Pattern_White_Space:]] plus stability > extensions. U+2E2F has the `Pattern_Syntax` property and is thus not a valid `ID_Start` code point. _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
