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？
Upper_case takes in an array of matches and returns the whole matched pattern in uppercase.
函数upper_case接收匹配结果数组，并将整个匹配结果转化成大写。
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