Fetch string between two special character using regex

From my point of view, using a regular expression is an engineering overkill. Fact is that regular expressions were designed for complex operations on strings, and getting the text between a separator (or "special character", as you call it) is not considered a complex operation. All of the major frameworks which (basically 99% of all languages) provide a string class also provide a method to split a string by a separator.
In C#, you can achieve what you want in the following way:

using System;

public class SplitTest {
    public static void Main() {

        string yourString= "-aaa-bbb-ccc-ddd-eee-fff-ggg-hhh-iii-jjj-kkk-lll-"

        string [] split = words.Split(new Char [] {'-'}, StringSplitOptions.RemoveEmptyEntries);//set your list of separators, Empty entries ("") are removed

        foreach (string s in split) {
                Console.WriteLine(s);
        }
    }
}
// The example displays the following output to the console:
//       aaa
//       bbb
//       ccc
//       ddd
//       eee
//       fff
//       ggg
//       hhh
//       jjj
//       kkk
//       lll