Wout12345 | Inverted replacer 1.0 - MCEdit filter @Wout12345 | Uploaded 9 years ago | Updated 1 hour ago
Just a little filter which behaves very similar to the standard fill and replace tool, but then ... opposite, basically. Just watch the video. :P

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Links

FILTER DOWNLOAD
http://www.mediafire.com/view/5iogujoegqojc99/Inverted_replacer.py

MicroMacComp/Spohnicus/Spock
http://www.youtube.com/MicroMacComp

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Missed anything? Let me know in the comments!