There are two strings.
String str1="Order Number Order Time Trade Number";
String str2="Order Tm";
Then I want to know that str2 matches with which substring in the str1.
string regex = Regex.Escape(str2.Replace(@"\ ", @"\s*");
bool isColumnNameMatched = Regex.IsMatch(str1, regex, RegexOptions.IgnoreCase);
I am using regex because "Order Tm" will also matches "Order Time".It gives bool value that matches occurred or not.
Like str2="Order Tm"
then it should return like in the str1,Order Time is the substring where matches is occurred.