Math in Vim search and replace

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In Vim, you can use function or math in search and replace.

7100,111,222,0
7100,333,444,1
7100,555,666,2

:%s/\(\d*\)$/\=2-submatch(1)/g

7100,111,222,2
7100,333,444,1
7100,555,666,0

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