In C #, / is the escape character, character escape sequences as follows
/' Single quote
/" Double quote
// Backslash
/0 null
/a warning
/b backspace
/f new page
/n new line
/r enter
/t horizontal tab
/v vertical tab
string str= "The destination 'c://test.txt' already exists."; string strP = "The destination 'c://test.txt' already exists."; Console.WriteLine(str); Console.WriteLine(strP); Console.WriteLine("Done"); bool a = Regex.IsMatch( str, strP, RegexOptions.IgnoreCase); Console.WriteLine(a); Console.Read(); //value of a is False, so the double backslash will affect the result string str= "The destination 'c://test.txt' already exists."; string strP = "The destination 'c://test.txt' already exists."; Console.WriteLine(str); Console.WriteLine(strP); Console.WriteLine("Done"); bool a = Regex.IsMatch( str, strP.Replace(@"/", @"//"), RegexOptions.IgnoreCase); Console.WriteLine(a); Console.Read(); //value of a is True,but i don't know why
