using System;
using System.Text.RegularExpressions;
using System.Collections.Specialized;
class Program {

static void Main() {
string yourstring = @"1.1 - Hello
1.2 - world!
2.1 - Some
data
here and it contains some 32 digits so i cannot use \D+
2.2 - Etc..";
var resultList = new StringCollection();
try {
	var yourRegex = new Regex(@"(?sm)^\d+\.\d+\s*-\s*((?:.(?!^\d+\.\d+))*)");
	Match matchResult = yourRegex.Match(yourstring);
	while (matchResult.Success) {
		resultList.Add(matchResult.Groups[1].Value);
    Console.WriteLine("Whole Match: " + matchResult.Value);
    Console.WriteLine("Group 1: " + matchResult.Groups[1].Value + "\n");
		matchResult = matchResult.NextMatch();
	} 
} catch (ArgumentException ex) {
	// Syntax error in the regular expression
}

Console.WriteLine("\nPress Any Key to Exit.");
Console.ReadKey();
} // END Main
} // END Program