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.