Question

I have some strings that are like FFS\D46_24\43_2 I want to return the text between the first backslash and last underscore. In case of above example, I want to get D46_24\43

I tried the code below but it throws argument out of range exepction:

    public string GetTestName(string text)
    {
        return text.Remove(
            text.IndexOf("\\", StringComparison.InvariantCultureIgnoreCase)
            ,
            text.LastIndexOf("_", StringComparison.InvariantCultureIgnoreCase)
            );
    }

Answer 1

The second parameter is a count, not an ending index. Additionally, the correct method to isolate part of a string is Substring and not Remove. So you have to write it as

var start = text.IndexOf("\\", StringComparison.InvariantCultureIgnoreCase);
var end = text.LastIndexOf("_", StringComparison.InvariantCultureIgnoreCase);

// no error checking: assumes both indexes are positive
return text.Substring(start + 1, end - start - 1);