2.1.21 [ECMA-262/5] Section 188.8.131.52, Atom
The specification defines the productions for Atom.
In addition to the existing productions for Atom, include identical productions for AtomNoBrace, except replacing Atom :: PatternCharacter with:
The production AtomNoBrace :: PatternCharacterNoBrace evaluates as follows:
1. Let ch be the character represented by PatternCharacterNoBrace. 2. Let A be a one-element CharSet containing the character ch. 3. Call CharacterSetMatcher(A, false) and return its Matcher result.