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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.
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Case Insensitive Search By default, grep is case sensitive. This means that the uppercase and lowercase characters are treated as distinct. To ignore case when searching, invoke grep with the -i option (or --ignore-case ).
Case-insensitive file searching with the find command The key to that case-insensitive search is the use of the -iname option, which is only one character different from the -name option. The -iname option is what makes the search case-insensitive.
Case-insensitive search in Vim. If you want this behavior by default, you can turn on the option: set ignorecase. There's also a so-called "smartcase" ( :help smartcase ) which works as case-insensitive if you only use lowercase letters; otherwise, it will search in case-sensitive mode.
Searches normally are case-sensitive: a search for "china" will not find "China." If you want vi to ignore case during a search, type :set ic . To change it back to the default, case-sensitive mode, type :set noic . If vi finds the requested string, the cursor will stop at its first occurrence.
You can use the \c escape sequence anywhere in the pattern. For example:
/\ccopyright or /copyright\c or even /copyri\cght
To do the inverse (case sensitive matching), use \C (capital C) instead.
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As well as the suggestions for \c and ignorecase, I find the smartcase very useful. If you search for something containing uppercase characters, it will do a case sensitive search; if you search for something purely lowercase, it will do a case insensitive search. You can use \c and \C to override this:
:set ignorecase :set smartcase /copyright " Case insensitive /Copyright " Case sensitive /copyright\C " Case sensitive /Copyright\c " Case insensitive See:
:help /\c :help /\C :help 'smartcase' If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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