不包含特定字符串的匹配

正则表达式匹配不包含特定字符串的文本，相信很多初学者都会范难(特指本人)。

下面找到一个匹配：

^((?!string).)*$

其中 string 是要排除的字符串。

文本如下：

# particular features to be enabled - so if something's not working as
# you might expect, make sure that you have specifically enabled it
# below.
#

#
all# DocumentRoot: The directory out of which you will serve your
# documents. By default, all requests are taken from this directory, but
# symbolic links and aliases may be used to point to other locations.
#

(呵呵， 偷了个懒，随手截了httpd.conf的内容)

配置所有不包含 "all"的行，匹配结果如下：

除了红色下划线标注的行都匹配到了



参考文章：
http://www.vaikan.com/regular-expression-to-match-string-not-containing-a-word/