Use the a command to add a line of text after a given matched pattern.
使用a命令在给定的匹配模式后面添加一行文本。
What if you want to include the literal matched pattern in the replacement text?
如果您希望在替换文本中包括字面匹配的模式，该怎么办呢？
A pattern is matched against elements in the source tree.
模式(pattern)用于匹配“源树”中的元素。
A pattern is matched against elements in the source tree.
模式(pattern)用于匹配“源树”中的元素。
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