Vim What?Commandsr
r

The r command in Vim

Command

replace char

Replace — replace the character under cursor with the next typed character, then stay in Normal mode.
Examples
Related plugin

tpope/vim-abolish — cr{suffix} coerces word case under cursor: crs (snake_case), crc (camelCase), crm (MixedCase), cru (UPPER_CASE), cr- (dash-case).

Reference

Official Vim help for r

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