(< [!^13]*^13) (*)\1中, (< [!^13]*^13)是第一个表达式, (*)是第二个表达式,那么\1指的就是 (< [!^13]*^13),\2指的就是 (*) 那么这一句连起来的意思就是查找一个字符串,第一个部分以回车符结.
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