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Vim Regex

PT2/editor/vim vim regex does not exist
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14 lines, 44 words, 322 chars Page 'RegEx' does not exist.

See vimregex.

Change Case

:s/[A-Z]\+/\l& -- lowercase first letter with \l
:s/[A-Z]\+/\L& -- lowercase all letters with \L
:s/[a-z]\+/\u& -- uppercase first letter with \u
:s/[a-z]\+/\U& -- uppercase all letters with \U

Title Case

From :help case

:s/\v<(.)(\w*)/\u\1\L\2/g