Непонятки с glib regex

			try {
				var r = new Regex ("[IVX]+", RegexCompileFlags.NEWLINE_LF);
				MatchInfo mi;
				
				if (r.match (tb.text, RegexMatchFlags.NEWLINE_LF, out mi)) {
					do {	
						int sp, ep;
						mi.fetch_pos (0, out sp, out ep);
	
						TextIter begin_attr;
						TextIter end_attr;
	
						tb.get_iter_at_offset (out begin_attr, tb.text.char_count (sp) );
						tb.get_iter_at_offset (out end_attr, tb.text.char_count (ep));
	
						tb.apply_tag_by_name ("bold", begin_attr, end_attr);
						
		
					} while (mi.next ());
				}
			}
			catch (RegexError e) { stdout.printf ("Regex error\n"); }

class Demo.HelloWorld : GLib.Object {

    public static int main(string[] args) {
	string text = "some русский text with VI \nand XI XXX\n\r XIV";

	var r = new Regex ("[IVX]+");
	MatchInfo mi;
				
	if (r.match (text, 0, out mi)) {
		do {
			int sp, ep;
			mi.fetch_pos (0, out sp, out ep);
			stdout.printf("%i %i\n", text.char_count(sp), text.char_count(ep));
		} while (mi.next());
	}
        return 0;
    }
}

static void
linkify_cb (GtkTextBuffer *buf, GRegex *regex)
{
  gchar *text;
  GtkTextIter start, end;
  GMatchInfo *match;

  gtk_text_buffer_get_bounds (buf, &start, &end);
  text = gtk_text_buffer_get_text (buf, &start, &end, FALSE);

  gtk_text_buffer_remove_all_tags (buf, &start, &end);

  if (g_regex_match (regex, text, G_REGEX_MATCH_NOTEMPTY, &match))
    {
      do
        {
          gint sp, ep, spos, epos;

          g_match_info_fetch_pos (match, 0, &sp, &ep);

          /* positions are in bytes, not character, so here we must normalize it*/
          spos = g_utf8_pointer_to_offset (text, text + sp);
          epos = g_utf8_pointer_to_offset (text, text + ep);

          gtk_text_buffer_get_iter_at_offset (buf, &start, spos);
          gtk_text_buffer_get_iter_at_offset (buf, &end, epos);

          gtk_text_buffer_apply_tag (buf, tag, &start, &end);
        }
      while (g_match_info_next (match, NULL));
    }
  g_match_info_free (match);

  g_free(text);
}