正则表达式，用于在目录名而不是文件名中用下划线替换破折号

Question

The string example is:

/my/test-is/for-this/to/work-right.txt

should be:

/my/test_is/for_this/to/work-right.txt

Anyone want to flex their Regex-Fu muscles?

Answer 1

No, not really. It's much better to use Path.GetDirectoryName and friends:

var s = "/my/test-is/for-this/to/work-right.txt";
var result = Path.Combine(
     Path.GetDirectoryName(s).Replace("-", "_"),
     Path.GetFileName(s)
);

If your path uses / as the directory separator, you are running on Windows and you don't want it to be replaced by \\ you can simply undo the replacement afterwards:

// What I 'm really doing here is showing that these constants exist;
// read the manual to see what you can expect from them.
result = result.Replace(
    Path.DirectorySeparatorChar,
    Path.AltDirectorySeparatorChar
);