A proper implementation would take a closer look at the replacement string.
恰当的实现应该进一步检查替换字符串。
The replacement string may contain references to subsequences captured during the previous match.
替换字符串可能包含对在之前的匹配中捕获的子序列的引用。
You can also refer to a subexpression from within a replacement string.
还可以从替换字符串中引用子表达式。
You can also refer to a subexpression from within a replacement string.
还可以从替换字符串中引用子表达式。
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