regexp: lookahead but not lookbehind?

[arghman]

Just curious:

http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Objects:RegExp

this mentions lookahead operators (?=y) and (?!y) but not the
lookbehind operators (?<=y) and (?<!y). are there any plans to add in
future versions?
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