Bug of new RegExp

[toshiyuki kojima]

Hello,

I found a bug of new RegExp, (new RegExp('')).toString() should return not
'//' but '/(?:)/'.


I confirmed this bug using following revision:

  changeset:   0532397d0732

  date:        Mon Jul 29 18:07:20 2013 +0530

  summary:     8012792: print function defined in engine.js does not handle
multiple arguments Reviewed-by: hannesw


http://ecma-international.org/ecma-262/5.1/#sec-15.10.4.1


Thanks,

--gocho

twitter.com/gocho