On Jul 6, 2011, at 4:35 PM, Dave Fugate wrote: > var x = /\1/; > > According to 15.10.2.11, the RegExp snippet above should throw something as > there aren’t any capturing parenthesis within the RegExp, yet one is > referenced. Just now noticed that step 4 of 15.10.2.9 is more precise and > shows a SyntaxError gets thrown. Isn’t the snippet then potentially valid > ES5 code through Chapter 16’s SyntaxError extension clause?
It isn't valid ES5 code but it valid as an implementation defined extension to ES5.
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