如何获得不同情况下的特定子字符串

执行按空格分割的字符串,包含数组索引5将包含用户名。

public void SplitExample()
{
    List<string> Lines = new List<string>()
    {
       "[20:03:01 INFO]: UUID of player MyUsername123 is b87e1cbc-c67c-4026-a359-8659de8b4",
       "[21:03:10 INFO]: UUID of player Cool_Username is b7ecbc-c67c-4026-a359-8652f9de8b4",
       "[22:23:10 INFO]: UUID of player theuserN4m3 is b87eabc-c67c-4026-a359-8652ad9dssdse8b4",
       "[20:08:10 INFO]: UUID of player WhatANiceUsername is b87g1cbc-c67c-4026-a359-8652agde8b4",
    };

    foreach(var i in Lines)
    {
       var splitArray = i.Split(' ');
       Console.WriteLine(splitArray[5]);
    }
}

space 字符,然后抓取用户名字段的索引(因为您说过它总是在同一个位置)。

foreach (var line in Lines)
{
    string[] trimmed = line.Split(' ');
    string username = trimmed[5];
}

您可能希望在错误处理方面做得更好一些,但这应该可以让您开始。

字符串本质上是一个 IEnumerable<char> Skip() TakeWhile() Linq中用于从字符串中提取用户名的扩展方法:

var usernames = lines.Select(
    line => new String(line.Skip(32).TakeWhile(c => !char.IsWhiteSpace(c)).ToArray()));

不停摆弄 here

另一种LINQ ish解决方案:

  List<string> lines = new List<string>()
  {
      "[20:03:01 INFO]: UUID of player MyUsername123 is b87e1cbc-c67c-4026-a359-8659de8b4",
      "[21:03:10 INFO]: UUID of player Cool_Username is b7ecbc-c67c-4026-a359-8652f9de8b4",
      "[22:23:10 INFO]: UUID of player theuserN4m3 is b87eabc-c67c-4026-a359-8652ad9dssdse8b4",
      "[20:08:10 INFO]: UUID of player WhatANiceUsername is b87g1cbc-c67c-4026-a359-8652agde8b4",
  };

  IEnumerable<string> players = from line in lines select line.Split(' ')[5];