also try this regex code
string s = @"\Library\Daino Royal - A.jpg,\Library\Abc.jpg,\Library\DEF.jpg,\Library\GHI.jpg,\Library\TIVOLI_GREY_A.jpg,\Library\URBANA_GREY - C.jpg";
MatchCollection matches = Regex.Matches(s, @"(\w*.jpg)");
string[] imgFileName = new string[matches.Count];
int i=0;
foreach (Match match in matches)
{
imgFileName[i] = match.Value;
MessageBox.Show(match.Value);
i++;
}