How to make case insensitive search in Vim/Vi

By default, Vim/Vi’s search is case sensitive. However, if I want to search case insensitively, is there any method?

For example, I search for dot, instead of dog, I also want to find out phases containing Dog, DOg, etc.

There are several methods:

1. Setting the search to be case insensitive in Vim

:set ignorecase

To unset it:

:set noignorecase

You can also put it to your .vimrc if you want the behavior to be the default one.

2. You can also force a patten to be case insensitive or sensitive by c or C regardless the setting of ignorecase.

For example, the search /dogc is always case insensitive. And /dog/C is always case sensitive.

3. Use smartcase

To enable it:

:set smartcase

If your search pattern is purely lowercase, it will search case insensitively.
If your search pattern contains uppercase characters, it will search case sensitively.

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