work then: >

	:?^Chapter?,/^Chapter/s=grey=gray=g

You can see a search pattern is used twice.  The first "?^Chapter?" finds the
line above the current position that matches this pattern.  Thus the ?pattern?
range is used to search backwards.  Similarly, "/^Chapter/" is used to search
forward for the start of the next chapter.
   To avoid confusion with the slashes, the "=" character was used in the
substitute command here.  A slash or another character would have worked as
well.


ADD AND SUBTRACT

There is a slight error in the above command: If the title of the next chapter
had included "grey" it would be replaced as well.  Maybe that's what you
wanted, but what if you didn't?  Then you can specify an offset.
   To search for a pattern and then use the line above it: >

	/Chapter/-1

You can use any number instead of the 1.  To address the second line below the
match: >

	/Chapter/+2

The offsets can also be used with the other items in a range.  Look at this
one: >

	:.+3,$-5

This specifies the range that starts three lines below the cursor and ends
five lines before the last line in the file.


USING MARKS

Instead of figuring out the line numbers of certain positions, remembering them
and typing them in a range, you can use marks.
   Place the marks as mentioned in chapter 3.  For example, use "mt" to mark
the top of an area and "mb" to mark the bottom.  Then you can use this range
to specify the lines between the marks (including the lines with the marks): >

	:'t,'b


VISUAL MODE AND RANGES

You can select text with Visual mode.  If you then press ":" to start a colon
command, you will see this: >

	:'<,'>

Now you can type the command and it will be applied to the range of lines that
was visually selected.

	Note:
	When using Visual mode to select part of a line, or using CTRL-V to
	select a block of text, the colon commands will still apply to whole
	lines.  This might change in a future version of Vim.

The '< and '> are actually marks, placed at the start and end of the Visual
selection.  The marks remain at their position until another Visual selection
is made.  Thus you can use the "'<" command to jump to position where the
Visual area started.  And you can mix the marks with other items: >

	:'>,$

This addresses the lines from the end of the Visual area to the end of the
file.


A NUMBER OF LINES

When you know how many lines you want to change, you can type the number and
then ":".  For example, when you type "5:", you will get: >

	:.,.+4

Now you can type the command you want to use.  It will use the range "."
(current line) until ".+4" (four lines down).  Thus it spans five lines.

==============================================================================
*10.4*	The global command

The ":global" command is one of the more powerful features of Vim.  It allows
you to find a match for a pattern and execute a command there.  The general
form is: >

	:[range]global/{pattern}/{command}

This is similar to the ":substitute" command.  But, instead of replacing the
matched text with other text, the command {command} is executed.

	Note:
	The command executed for ":global" must be one that starts with a
	colon.  Normal mode commands can not be used directly.  The |:normal|
	command can do this for you.

Suppose you want to change "foobar" to "barfoo", but only in C++ style
comments.  These comments start with "//".  Use this command: >

	:g+//+s/foobar/barfoo/g

This starts with ":g".  That is short for ":global", just like ":s" is short
for ":substitute".  Then the pattern, enclosed in plus characters.  Since the
pattern we are looking for contains a slash, this uses the plus character to
separate the pattern.  Next comes the substitute command that changes "foobar"
into "barfoo".
   The default range for the global command is the whole file.  Thus no range
was specified in this example.  This is different from ":substitute", which
works on one line without a range.
   The command isn't perfect, since it also