Question

I’m trying to convert a string with modified GUID (e.g. 6b5737e5728786794fff5e009d74d706) to a hex string with format like \x..\x..

(String format and hex chars doesn’t work for me). Any ideas?

Answer 1

Regex.Replace(myString, ".{2}", "\\x$0");

If you want to go a non-regex route, then the following might work:

string s = "6b5737e5728786794fff5e009d74d70";
var sb = new StringBuilder($s.Length * 2);

for (int i = 0; i < s.Length; i+=2)
  sb.Append("\\x").Append(s.Substring(i, [Math]::Min(2, s.Length - i)));

string myNewString = sb.ToString();

If you want your string to contain (for your example) the code points U+006B, U+0057, U+0037, &c. then think again please. Strings are no byte containers, they are text containers. You want a byte[] in that case:

byte[] byteArray = new byte[(s.Length + 1) / 2]
for (int i = 0; i < s.Length; i+=2)
  byteArray[i/2] = Convert.ToByte(s.Substring(i, [Math]::Min(2, s.Length - i)));