java.util.regex.PatternSyntaxException: Unexpected internal error near index 1 \ ^
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报错java.util.regex.PatternSyntaxException: Unexpected internal error near index 1 \ ^
报这个错的原因是因为在java中“\”是一个转义字符，所以需要用两个代表一个。例如
System.out.println(“\\”);只会打印出一个\，但是“\”也是正则表达式中的转移字符在java中split的参数就是正则表达式，所以需要连个代表一个，所以:\\\\被java转换成\\又被正则转换成\
另外 replaceAll，split等java方法中的参数都是正则表达式，如果是\的话都需要写\\\\
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