How to use String#split with a backslash character?

问题:

I would like to split this string:

 C:\RCOUNT2013\2013_Extracted\Weekly ODEN Notices Report.12-28-2013.2013-12-29 07-20-51.pdf.log.0 

on the \. What would the regex be?

string.split("\\ \")  // ? 

回答1:

In regex-land, a \ is an escape character, so to obtain a literal \ we need to escape it: \\. However, in Java strings, \ is also an escape character, so we need to escape each \ a second time, resulting in \\\\. Therefore, this is what you want:

str.split("\\\\") 

回答2:

split("\\\\") 

Double-escaping "\"

回答3:

The regex would be "\\\\"

In the source code: "\\\\"

After compiling, the string is: "\\"

And the regex parser interperets this as look for a \, So it matches one backslash '\'

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