ecmascript-262 5th edition spec:
[ RegularExpressionClassChars ]
RegularExpressionNonTerminator except (']', '')
SourceCharacter except LineTerminator
SourceCharacter :: "any Unicode code unit"
LineTerminator:: LF | CR | LS | PS
ecmaScript-262 3rd edition is less clear, but also allows '/'
inside a character-class.
I personally would advise escaping such forward-slashes to improve clarity,
but I wouldn't emit the current "Unescaped '/'" message.
Please pass on to maintainers of jslint as well, same applies :)
I don't know if we're going to remove this warning but wording it differently makes sense.