I wouldn't use a regex, just String.Split twice:
string text = "›¢øñ}xxxix,{ †‡ƒ«. :›¢øñ";
string[] withoutClose = text.Split('}');
if (withoutClose.Length == 2)
{
string[] withoutOpen = withoutClose[1].Split('{');
if (withoutOpen.Length == 2)
{
string start = withoutClose[0];
string middle = withoutOpen[0];
string end = withoutOpen[1];
}
}