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string str1 = "UploadImgs\\baidu.jpg";
str1 = str1.Replace(str1.Substring(0, str1.IndexOf("\\") + 1), "").Replace(".jpg","");
string str = @"UploadImgs\baidu.jpg";
int bengin = str.IndexOf("\\");
str = str.Remove(0, bengin + 1);
int end = str.IndexOf(".");
str = str.Substring(0, end);
MessageBox.Show(str);
string str = @"UploadImgs\baidu.jpg";
Regex reg = new Regex(@"(?<=\\)[^\\.]+", RegexOptions.RightToLeft);
Console.WriteLine(reg.Match(str).Value);