How to find all occurrences of strings between two strings or two keywords in C#?

Hi Jhon,
You can use following method to extract these strings in the form of a List of strings.

public List<string> GetListOfStringsBetweenTwoKeyWords(string source, string start, string end)
        {
            List<string> results = new List<string>();
            string pattern = string.Format(
                "{0}({1}){2}",
                Regex.Escape(start),
                ".+?",
                 Regex.Escape(end));
            foreach (Match m in Regex.Matches(source, pattern, RegexOptions.Singleline))// RegexOptions.Singleline | RegexOptions.Multiline
            {
                results.Add(m.Groups[1].Value);
            }
            return results;
        }

And you call this method in the following way to get your desired result.

string sourceString = "<SomeString> This is first string </SomeString><SomeString> This is Second string </SomeString>";
List<string> results = GetListOfStringsBetweenTwoKeyWords(sourceString, "<SomeString>", "</SomeString>");