Accidentally corrupted graphics (?) data of notebook --- now it won't open

In the process of editing my scripts' variable names with a haphazard "replace in all open files" in my text editor, I accidentally replaced portions of graphics data in a notebook (and I believe this is the only issue with the notebook). Here's a sample of my notebook in my text editor:

Cell[BoxData[
  Graphics3DBox[GraphicsComplex3DBox[$Failed, {{
   {Opacity[0.4], EdgeForm[None], 
     GraphicsGroup3DBox[{Polygon3DBox[CompressedData["
1:eJxNnXeYFcXz9e/esIiiIFGUKNw7d0Ewo0y4CIKKAdDdvYqKAQOKOWfFnHPO
OWdRMSsgmHPOIKhgzgnR93z29Pf5vX/M0zU93T09Mz3d1VWnqvpP3m+rffO5
...

SIz7Av/VL5TBhqJPyesWaxZ5/ULdD6rGk39asT0GPMtTShc12+f3763GSrJP
eEPn42ueVxM9322Z2wHfOz3zHo292vZgj0rBN2yz/cX+qXbWVt46Op7\[CapitalOmega]2S8X
PkPQO5K3ZsifUHP+JrF9m+Lj9FXWmcR2+a8n3i/jAwIM6OiS8aPgNuKQzz76
4cx7TXSVD2Teu+MDFhwgfljAOT2aud6Wsf2U0A54IVLaBUP0ZtX22vhBf67Z

The \[CapitalOmega] doesn't belong. Unfortunately, "undo" is no longer available, and there's no obvious way for me to sift through and re-replace some of the symbols that I changed (for instance, they aren't all obvious like \[CapitalOmega]). Mathematica can no longer open the notebook (I wait while it grinds and heats-up, then have to force-quit).

Is there some way to delete the graphics (or even all output cells) from the text file? I was considering just trying this (deleting the cells that seem like graphics), but it seems like there might be a lot of ways this could go wrong. Help!

Answer

This should give you back most of your work:

code = Import[

   "https://bitbucket.org/ricopicone/corruptmathematicanotebook/raw/master/CMN.nb", 
   "NB"];
CreateDocument[
 code /. Cell[BoxData[(Graphics3DBox | GraphicsBox)[___]], ___] :> 
   Cell[TextData[
     StyleBox["Here was a graphics", FontColor -> RGBColor[1, 0, 0]]],
     "Text"]]

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