Is there a utility to replace one block type with another within a region?

Question

I'd like to be able to select a region (either with a graphical utility or command line) and be able to switch one block type with another, e.g. change all cobblestone in the region to stone. Does a program/mod exist that can do this?

Answer

WorldEdit has such a command after selecting the area type

//replace [old block] [new block]

This will turn all of the first block from the area into the second block.

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