[Webkit-unassigned] [Bug 206768] New: Invalid ranges in character classes should be banned in unicode patterns

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206768

            Bug ID: 206768
           Summary: Invalid ranges in character classes should be banned
                    in unicode patterns
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Trivial
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shvaikalesh at gmail.com

In ES5, grammar of CharacterRange was ambiguous, resulting in invalid ranges like /[\d-a]/ being allowed.
As of ES2015, invalid ranges are SyntaxError in unicode patterns, yet still allowed in regular ones to avoid breaking the web.

Test case:
  /[a-\d]/u

Expected:
  SyntaxError thrown

Actual:
  RegExp instance

ECMA262: https://tc39.es/ecma262/#sec-patterns-static-semantics-early-errors-annexb
Test262:
  https://test262.report/browse/built-ins/RegExp/unicode_restricted_character_class_escape.js
  test/built-ins/RegExp/property-escapes/character-class-range*.js
  test/language/literals/regexp/u-invalid-non-empty-class-ranges*.js

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