git-config-set: support selecting values by non-matching regex

Extend the regex syntax of value_regex so that prepending an exclamation
mark means non-match:

	[core]
		quetzal = "Dodo" for Brainf*ck
		quetzal = "T. Rex" for Malbolge
		quetzal = "cat"

You can match the third line with

	git-config-set --get quetzal '! for '

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 17 insertions, 1 deletions

diff --git a/Documentation/git-config-set.txt b/Documentation/git-config-set.txt
index c707fbcf99..bfbd42147a 100644
--- a/Documentation/git-config-set.txt
+++ b/Documentation/git-config-set.txt
@@ -22,7 +22,9 @@ actually the section and the key separated by a dot, and the value will be
 escaped.
 
 If you want to set/unset an option which can occor on multiple lines, you
-should provide a POSIX regex for the value.
+should provide a POSIX regex for the value. If you want to handle the lines
+*not* matching the regex, just prepend a single exlamation mark in front
+(see EXAMPLES).
 
 This command will fail if
 
@@ -82,6 +84,7 @@ Given a .git/config like this:
 		command="ssh" for "ssh://kernel.org/"
 		command="proxy-command" for kernel.org
 		command="myprotocol-command" for "my://"
+		command=default-proxy ; for all the rest
 
 you can set the filemode to true with
 
@@ -139,6 +142,19 @@ new one with
 % git config-set --replace-all proxy.command ssh
 ------------
 
+However, if you really only want to replace the line for the default proxy,
+i.e. the one without a "for ..." postfix, do something like this:
+
+------------
+% git config-set proxy.command ssh '! for '
+------------
+
+To actually match only values with an exclamation mark, you have to
+
+------------
+% git config-set section.key value '[!]'
+------------
+
 
 Author
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