引用其他来源的资料要放在引号里。
请注意双引号的使用,它确保了原始命令中引用的参数被保留并得到正确识别。
Note the use of double quotes, which ensures that quoted arguments in the original are retained and identified properly.
\ 9用来引用已获取的子模式,在这个例子中,变量\ 1就保存着第一个匹配的引号。
\ 9 hold references to previously captured subpatterns. The first matched quote, in this case, will be held by the variable \ 1.
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