[Webkit-unassigned] [Bug 209528] New: \b escapes inside character classes should be valid in Unicode patterns

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209528

            Bug ID: 209528
           Summary: \b escapes inside character classes should be valid in
                    Unicode patterns
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shvaikalesh at gmail.com

Test case:
  /[\b]/u.test("\u0008")

Expected:
  true

Actual:
  SyntaxError thrown

ECMA262:
  According to ClassEscape grammar (https://tc39.es/ecma262/#prod-ClassEscape), "b" comes before
  CharacterEscape :: IdentityEscape. Also, see the note in https://tc39.es/ecma262/#sec-classescape.

Test262:
  JSTests/test262/test/built-ins/RegExp/unicode_character_class_backspace_escape.js

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