date: 111025 search
:set [ic|noic]sets globaly the search to ["ignore case"|"not ignore case"] (not to be or be a case sensitive searcher ).
%s/myMixedCaseWord/ReplacedWord/gilet you search/replace with ignored case
/thIsISmyCaseInsensitVSearch\csearchs for your term with ignored case
date: 111229 search and replace
$r (the range) can be: % - the whole file 23 - works on line 23 $ - nothing, only for current line.
$a (the argument) can be: g - whole line i - be case insensitive I - be case sensitive c - commit every change [y|n] $ - nothing, only first searchterm will be replaced.