never mind i figured it out
replaces all stone with dirt inside area
fill -333 ~-1 274 -330 ~1 271 minecraft:dirt 0 replace minecraft:stone
Syntax: /fill [x] [y] [z] [x] [y] [z] [BlockName] [Data] replace [filterBlockName] [filterData]
http://www.minecraftforum.net/
NOTABLE MAPMAKER ADDITIONS:
New command /particle to show particle effects in the world. It can also be relative to entities. Example: /particle lava ~ ~1 ~ 1 1 1 0.5 2 @e[type=Chicken]
Added the ability to filter block types in the /fill command, but only if it’s used to fill in replace mode with “normal” blocks. It does not work when filling with block entities. Syntax: /fillreplace [filterBlockName] [filterData]
Fixed most of the remaining issues with the /clone command, for example chest orientation.
happens for me and im playing single player 14w04b creative, haven't tried other gamemode's