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怎么从右边向左截取字符串

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Release： 2016-06-13 12:33:35
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如何从右边向左截取字符串

本帖最后由 goolean 于 2013-09-30 21:31:47 编辑 字符串为："。。还有很多。。001_002_003",想要从右边第4个(_003)开始,得到向左的所有字符串“。。还有很多。。001_002"

应当如何实现 ，字符串的长度不确定，所以只能从右边开始载
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