构建正确的正则表达式时遇到问题

Question

尝试构造一个正则表达式，它将匹配下面列表的每一行。

6220 1 10 Because he's the hero Gotham deserves, 
6220 9 10 
5181 5 7 in time, like tears in rain. Time to die. 
6220 3 10 So we'll hunt him. 
6220 5 10 Because he's not a hero. 
5181 6 7  
5181 2 7 shoulder of Orion. I watched C-beams 
5181 4 7 Gate. All those moments will be lost 
6220 6 10 He's a silent guardian. 
5181 3 7 glitter in the dark near the Tannhäuser 
6220 7 10 A watchful protector. 
5181 1 7 believe. Attack ships on fire off the 
6220 0 10 We have to chase him. 
5181 0 7 I've seen things you people wouldn't 
6220 4 10 Because he can take it. 
6220 2 10 but not the one it needs right now. 
6220 8 10 A Dark Knight. 

一切都很好，直到行有一个空白的“消息”，例如线2和6以下是当前正则表达式的模样。

var regex = new Regex(
    @"(?<id>\d+)\s+(?<index>\d+)\s+(?<count>\d+)\s+(?<message>.+)?"); 

foreach (Match match in regex.Matches(File.ReadAllText("samples.txt"))) 
{ 
    Console.WriteLine(match.Groups["message"].Value); 
} 

如果原始消息组为空白，则当前正则表达式会将其自己下方的行设置为消息。我已经尝试了很多东西，并且让消息可选。我如何让正则表达式将消息识别为空？

Answer 1

(?<id>\d+)\s+(?<index>\d+)\s+(?<count>\d+)\s(?<message>.+)? 

让你\s+一个\s所以有些事相匹配，而不是吃它