从字符串中获取值

Question

我收到了一个像这样的字符串：

"????log L 05/27/2012 - 08:02:57: \"Acid<1><STEAM_ID_PENDING><CT>\" say \"password somepass\"\n\0"

如何从此字符串中获取somepass？

Answer 1

您想要的比赛是

的第1组

\"password (.*?)\\"\\n\\0"

在C＃中，这变为

string resultString = null;

Regex regexObj = new Regex(@"""password (.*?)\\""\\n\\0""");

resultString = regexObj.Match(subjectString).Groups[1].Value;

Answer 2

string test = "????log L 05/27/2012 - 08:02:57: \"Acid<1><STEAM_ID_PENDING><CT>\" say \"password somepass\"\n\0";
string[] array = test.Split('\"'); ;
Console.WriteLine(array[3].Split(' ').Last());  //somepass

或者：

string password = string.Empty;

for (int i = 0; i < test.Length - 8; i++)
     if (test.Substring(i, 8) == "password")
          for (int j = i + 8; test[j] != '\"'; j++)
               if (test[j] != ' ')
                   password += test[j];

Console.WriteLine(password); //somepass

我对buckley给出的答案感兴趣，所以我使用这三种方法做了一个基准来获得"somepass"，使用这段代码：

string test = "????log L 05/27/2012 - 08:02:57: \"Acid<1><STEAM_ID_PENDING><CT>\" say \"password somepass\"\n\0";

Stopwatch timer = new Stopwatch();
timer.Start();

for (int n = 0; n < 10000000; n++)
{
     string[] array = test.Split('\"');
     string password = array[3].Split(' ').Last(); //somepass
}

timer.Stop();
TimeSpan time = timer.Elapsed;
Console.WriteLine(String.Format("{0:00}:{1:00}:{2:00}", time.Minutes, time.Seconds, time.Milliseconds / 10));

timer.Reset();
timer.Start();

for (int n = 0; n < 10000000; n++)
{
    string password = string.Empty;
    for (int i = 0; i < test.Length - 8; i++)
         if (test.Substring(i, 8) == "password")
             for (int j = i + 8; test[j] != '\"'; j++)
                 if (test[j] != ' ')
                      password += test[j]; 
} //somepass

timer.Stop();
time = timer.Elapsed;
Console.WriteLine(String.Format("{0:00}:{1:00}:{2:00}", time.Minutes, time.Seconds, time.Milliseconds / 10));

timer.Reset();
timer.Start();

for (int n = 0; n < 10000000; n++)
{
    string resultString = null;
    Regex regexObj = new Regex(@"""password (.*?)\\""\\n\\0""");
    resultString = regexObj.Match(test).Groups[1].Value; //somepass
}

timer.Stop();
time = timer.Elapsed;
Console.WriteLine(String.Format("{0:00}:{1:00}:{2:00}", time.Minutes, time.Seconds, time.Milliseconds / 10));

结果是（快照）：

我可以得出结论，在这种情况下，使用Split()方法（ 1475％）比使用Regex方法更快。