How to do case insensitive search in Vim

Question

I'd like to search for an upper case word, for example COPYRIGHT in a file. I tried performing a search like:

/copyright/i    # Doesn't work

but it doesn't work. I know that in Perl, if I give the i flag into a regex it will turn the regex into a case-insensitive regex. It seems that Vim has its own way to indicate a case-insensitive regex.

Answer 1

You can use the c escape sequence anywhere in the pattern. For example:

/ccopyright or /copyrightc or even /copyricght

To do the inverse (case sensitive matching), use C (capital C) instead.