把3个前后不是a与A的aaa换成xxx
时间：2006-01-21 来源：cnscn2008
:%s/\([^a|A]\)\(aaa\)\([^a|A]\)/\1xxx\3/g
串如下
aaadffaaafjdkfaaaaaaaaaafdAaaasfaaakdsfaaa a aaaaaaaaaaadddaaaaadfdaaaaaaaa
串如下
aaadffaaafjdkfaaaaaaaaaafdAaaasfaaakdsfaaa a aaaaaaaaaaadddaaaaadfdaaaaaaaa
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