vi

Case sensitive / insensitive search

\c \C can be in any position

/[\c][\C]<search>[\c][\C]

Expression	Description
`\c`	Case insensitive
`\C`	Case sensitive

"<register ID><command>

Register ID	Description
`0`	Most recent yank (copy)
`1`	Most recent delete or change
`2` - `9`	The 2nd - 9th recent delete or change
`a` - `z`	Only use when user specify
`A` - `Z`	Append to `a` - `z` register