Think of the `u` flag as a strict mode for regular expressions. `/\a/u` throws, because there is no reason to escape `a` as `\a` -- therefore, if such an escape sequence is present, it's likely a user error. The same goes for `/\-/u`. `-` only has special meaning within character classes, not outside of them.
On Fri, Sep 20, 2019 at 11:22 AM kai zhu <kaizhu...@gmail.com> wrote: > jslint previously warned against unescaped literal "-" in regexp. > > however, escaping "-" together with unicode flag "u", causes syntax error > in chrome/firefox/edge (and jslint has since removed warning): > > ```javascript > let rgx = /\-/u > VM21:1 Uncaught SyntaxError: Invalid regular expression: /\-/: Invalid > escape > at <anonymous>:1:10 > ``` > > just, curious on reason why above edge-case is a syntax-error? > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss >
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