fix replacement of ext -> ext2
fix replacement of ext -> ext2

backreference in regexp was interpreted as \22 instead of \2

kaufmo/koala-framework,koala-framework/koala-framework,kaufmo/koala-framework,yacon/koala-framework,kaufmo/koala-framework,nsams/koala-framework,yacon/koala-framework,nsams/koala-framework,nsams/koala-framework,koala-framework/koala-framework,yacon/koala-framework