RegEx and Vim Cookbook
Instead of running Vim in a terminal window, you might want to run it in a graphical shell, ie the GUI version of Vim for Windows and Linux, GVim. It has configurable menus and toolbars that make the program's most essential features easily accessible with a mouse. It also lets you use native file dialogs and gives you the ability to resize buffer panes by clicking and dragging. The equivalent for Mac OS X is MacVim, which provides a native Cocoa user interface, including menu integration.
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Delete all lines containing a pattern
The ex command g is very useful for acting on lines that match a pattern. You can use it with the d command, to delete all lines that contain a particular pattern, or all lines that do not contain a pattern.
For example, to delete all lines containing "profile" (the first command is optional; it shows the lines that the second command will delete):
:g/profile :g/profile/d
More complex patterns can be used, such as deleting all lines that are empty or that contain only whitespace:
:g/^\s*$/d
To delete all lines that do not contain a pattern, use g!, like this command to delete all lines that are not comment lines in a Vim script:
:g!/^\s*"/d
Note that g! is equivalent to v, so you could also do the above with:
:v/^\s*"/d
The next example shows use of \| ("or") to delete all lines except those that contain "error" or "warn" or "fail" (:help pattern):
:v/error\|warn\|fail/d
Line Feed and Carriage Return
Convert all tabs in a file to a CRLF
:%s/\t/\r\n/g
Note: UNIX uses LF (line feed) while Macintosh previously used CR (carriage return) and Microsoft uses CRLF (\r\n).
Replace spaces with a new line
:%s/\ /\r/g
Delete all blank lines form a text file
:g/^$/d
Note: The 'g' will execute a command on lines which match a regex. The regex is the 'blank line' and the command is :d (delete).
Sort alphabetically lines in a text file
Vim has a very powerful built-in sort utility that you can use to do a quick sort.
Quick sort all lines:
:%sort
Quick sort keep only unique lines:
:%sort u
Reverse sort
:%sort!
Sort numbers in numerical order:
:sort n
Add a space character at the beginning of each line
:%s/^/\ /