searching string from a text file?

Hi,

I am trying find a string (it will be an URI) from a text file containing lines of URIs.
basically each line has an URI.

I was trying to use this Regex method but I am getting the unescape character problem.
 readFile = new System.IO.StreamReader("StatusLog.txt");
            string allRead = readFile.ReadToEnd();
            readFile.Close();

            //If the match is found in allRead
           
            if (Regex.IsMatch(allRead, fileName)
            {
                return true;
            }
            else
            {              
                return false;
            }


Is there a way to fix this problem?
I am looking at the Regex.Escape() but not sure how to use it.

Is there another way I can search the string?
Should I do while loop and readline(), then compare?
Can't think a better way to do this?