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?
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