使用正则表达式和C＃识别另一个字符串中不存在的字符串

Question

I am trying to capture a string that does not contains in another string.

string searchedString = " This is my search string";
string subsetofSearchedString = "This is my";

My output should be "Search string". I would like to go with only regex so that I can handle complex strings.

The below is the code that I have tried so far and I am not successful.

 Match match = new Regex(subsetofSearchedString ).Match(searchedString );
 if (!string.IsNullOrWhiteSpace(match.Value))
 {
      UnmatchedString= UnmatchedString.Replace(match.Value, string.Empty);
 }

Update : The above code is not working for the below texts.

text1 = 'Property Damage (2015 ACURA)' Exposure Added Automatically for IP:Claimant DriverLoss Reserve Line :Property DamageReserve Amount $ : STATIP Role(s): Owner, DriverExposure Owner :Jaimee Watson_csr Author:
text2 = 'Property Damage (2015 ACURA)' Exposure Added Automatically for IP:Claimant DriverLoss Reserve Line :Property DamageReserve Amount $ : STATIP Role(s): Owner, Driver

Match match = new Regex(text2).Match(text1);

Answer 1

You can use Regex.Split :

var ans = Regex.Split(searchedString, subsetofSearchedString);

If you want the answer as a single string minus the subset, you can join it:

var ansjoined = String.Join("", ans);

Replacing with String.Empty will also work:

var ans = Regex.Replace(searchedString, subsetOfSearchedString, String.Empty);

Answer 2

Answer :

Regex wasn't working for me because of the presence of metacharacters in my string. Regex.Escape did not help me with the comparison.

String Contains worked like a charm here

if (text1.Contains(text2))
   {  
      status = TestResult.Pass;
      text1= text1.Replace(text2, string.Empty);
   }