Replacing forward-slash with a back-slash

Question

_{Wednesday, September 19, 2012 7:50 PM}

Hi,

I have this snippet written to replace all forward-slashes with a back-slash character. Console output as well as the debugger - do not show it as replaced.

 

static void Main(string[] args)
        {
            string filename = "/test/";
            string formattedFileName = FormatFileName(filename);
        }

public static string FormatFileName(string fileName)
        {
            Console.WriteLine(string.Format(@"Test fileName: {0}", fileName));

            string fileNameTemp = fileName;

            Regex.Replace(fileNameTemp, "/", @"\");

            Console.WriteLine(string.Format(@"Test fileName: {0}", fileNameTemp));

            return fileNameTemp;
        }

 

and here's the output:

Test fileName: /test/
Test fileName: /test/
Press any key to continue . . .

As you can see, no change in the input string. Anyone knows how to fix this?

Thanks!

All replies (3)

_{Wednesday, September 19, 2012 8:23 PM ✅Answered}

@ remond724

in case you're wondering, here's where you went wrong:

http://msdn.microsoft.com/en-us/library/e7f5w83z.aspx "Regex.Replace Method (String, String, String)"

public static string Replace(     //  <===  returns a String
    string input,
    string pattern,
    string replacement
)

Parameters

input              Type: System.String     The string to search for a match.

pattern           Type: System.String     The regular expression pattern to match.

replacement   Type: System.String      The replacement string.

Return Value     Type: System.String A new string that is identical to the input string, except that the replacement string takes the place of each matched string.

you MUST assign the returned string.

g.

---

_{Wednesday, September 19, 2012 8:11 PM}

@ remond724

your code works ... but you MUST assign the result:

void Main()
{
    string filename = "/test/"; 
    string formattedFileName = FormatFileName(filename); 

}

public static string FormatFileName(string fileName) 
{ 
    Console.WriteLine(string.Format(@"Test fileName: {0}", fileName)); 
    string fileNameTemp = fileName; 
    string regexResult = 
    Regex.Replace(fileNameTemp, "/", @"\"); 
    Console.WriteLine(string.Format(@"Test fileName: {0}", fileNameTemp)); 
    Console.WriteLine(string.Format(@"Test fileName: {0}", regexResult)); 
    return fileNameTemp; 
}

output:

Test fileName: /test/
Test fileName: /test/
Test fileName: \test\

g.

---

_{Wednesday, September 19, 2012 8:41 PM}

Thanks Gerry!