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This question already has an answer here:

The command :'<,'>s/search/replace/g will replace in the whole line of the current selection, but what if I want to substitute only inside the current selection, not the whole line?

Update: Found the duplicate.

marked as duplicate by muru Apr 17 '16 at 12:15

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Use :'<,'>s/\%Vsearch/replace/g

From help substitute:

For the definition of a pattern, see |pattern|.  In Visual block mode, use
|/\%V| in the pattern to have the substitute work in the block only.
Otherwise it works on whole lines anyway.

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