Returns the subsequence of the previous match.
返回以前匹配项的子序列。
For example, the previous match clause could be written this way.
例如，前面的match字句可以写成这样。
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。
A higher number means that an attempt to match the regex starting at the end of the previous match is done until all matches specified are found. Only the last match is returned.
更高的数字意味着在以前匹配结束后开始尝试匹配regex的操作将一直持续到发现所有指定的匹配，然后仅返回最后的匹配项。
We beat them 5-1 in our previous match this season.
我们在本赛季的早先一场比赛中5比1大胜过他们。
Djokovic said he was cramping and sore, and "didn't really have time to recover" from his previous match, which ended at 2:26 a. m. Monday.
德约科维奇说他已是筋疲力尽，他上一场比赛在周一凌晨2：26 才结束，他“没有足够的时间恢复”。
Djokovic said he was cramping and sore, and "didn't really have time to recover" from his previous match, which ended at 2:26 a. m. Monday.
德约科维奇说他已是筋疲力尽，他上一场比赛在周一凌晨2：26 才结束，他“没有足够的时间恢复”。
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