using System;
using System.Linq;
using System.Text.RegularExpressions;
public class Test
{
	public static void Main()
	{
		var s = "A ---\r\nsome text of many lines\r\nB ---\r\n\r\nother text with some lines\r\nand text and\r\ntext \r\n\r\nC --- \r\nmore text and tokens and text\r\n\r\nQQ--- \r\n\r\nmore text more text\r\n\r\nHH---\r\nJJ---\r\n";
        var pat = @"^(?<token>[a-zA-Z].--.*)(?<content>(?:\r?\n(?![a-zA-Z].---).*)*)";
        var result = Regex.Matches(s, pat, RegexOptions.Multiline)
        	.Cast<Match>()
        	.Select(m => new[] {m.Groups["token"].Value.Trim(), m.Groups["content"].Value.Trim()});
        foreach (var pair in result)
        	Console.WriteLine($"--- New match ---\nToken: {pair[0]}\nContent: {pair[1]}");
	}
 
}
 
 

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