C# 和正则表达式：如何提取引号之间的字符串

Question

假设我有以下字符串：

var 联赛 = 新数组（ "足球","德国 - 2. 德甲","38542195","102","2009 年 5 月 24 日 14:00","2009 年 5 月 24 日 14:00","1X2","1","0" ); var 匹配 = 新数组（ "125","1.FC 纽伦堡 - TSV 1860 慕尼黑","2009 年 5 月 24 日 14:00","Sun, 24.05.09 14:00","1|1.40|4.10|6.40|-","|| ||","1|1.90|3.50|2.20|0:1","1|1.05|2.20|1.18|-","1|2.00||1.60|2.5","1|3.40|3.20|1.60| 2","1|1.70|2.50|5.50|-","||||-","1", "126","FC Ingolstadt 04 - TuS Koblenz","2009 年 5 月 24 日 14:00","Sun, 24.05.09 14:00","1|3.60|2.80|2.00|-","|||| ","||||:","1|1.68|1.25|1.26|-","1|1.90||1.70|2.5","1|3.10|3.10|1.70|2","1|3.60| 2.10|2.45|-","||||-","1", "127","FC St.Pauli 1910 - FSV 法兰克福","2009 年 5 月 24 日 14:00","周日 24.05.09 14:00","1|2.50|2.95|2.60|-","|| ||","||||:","1|1.41|1.44|1.28|-","1|2.00||1.60|2.5","1|3.40|3.20|1.60|2","1| 2.95|2.00|3.05|-","||||-","1", "128","MSV Duisburg - VfL Osnabruck","2009 年 5 月 24 日 14:00","周日 24.05.09 14:00","1|2.30|3.60|2.40|-","||||" ,"||||:","1|1.35|1.51|1.27|-","1|2.10||1.55|2.5","1|3.60|3.20|1.55|2","||||- ","||||-","1", "129","FSV 美因茨 05 - SC Rot-Weiss Oberhausen","2009 年 5 月 24 日 14:00","Sun, 24.05.09 14:00","1|1.40|3.80|7.00|-","| |||","1|1.95|3.50|2.50|0:1","1|1.05|2.50|1.18|-","1|2.00||1.60|2.5","1|3.40|3.20|1.60 |2","1|1.70|2.30|5.50|-","||||-","1", "130","Rot-Weiss Ahlen - SpVgg Greuther Furth","2009 年 5 月 24 日 14:00","Sun, 24.05.09 14:00","1|2.55|3.20|2.55|-","|| ||","||||:","1|1.42|1.42|1.28|-","1|2.10||1.55|2.5","1|3.60|3.20|1.55|2","1| 3.00|2.00|3.00|-","||||-","1", "131","SC Freiburg - 1.FC Kaiserslautern","2009 年 5 月 24 日 14:00","Sun, 24.05.09 14:00","1|1.75|3.25|4.20|-","||| |","||||:","1|1.17|1.91|1.24|-","1|2.10||1.55|2.5","1|3.60|3.20|1.55|2","1|2.30 |2.10|3.80|-","||||-","1", "132","SV Wehen Wiesbaden - FC Hansa Rostock","2009 年 5 月 24 日 14:00","Sun, 24.05.09 14:00","1|5.00|3.70|1.55|-","||| |","||||:","1|2.23|1.09|1.23|-","1|1.90||1.70|2.5","1|3.10|3.10|1.70|2","1|4.50 |2.25|2.00|-","||||-","1", "133","TSV Alemannia Aachen - FC Augsburg","2009 年 5 月 24 日 14:00","Sun, 24.05.09 14:00","1|1.60|3.45|5.10|-","|||| ","||||:","1|1.11|2.13|1.23|-","1|2.10||1.55|2.5","1|3.60|3.20|1.55|2","1|2.10| 2.20|4.30|-","||||-","1" ); var events = showLeague（联赛，比赛）； hasEvents = hasEvents + 事件； 脚本>

我要做的是解析它读取“var 匹配”的部分并提取两个引号之间包含的任何内容。因此，期望的结果应该是一个包含：

(0): 125 (1): 1.FC 纽伦堡 - TSV 1860 慕尼黑 (2)：2009年5月24日14:00 等等。

注意：我看到有人回答了类似的问题，但经过一段时间后，我无法让它发挥作用。谢谢！

Answer 1

请不要为此使用正则表达式，CSV 应由解析器处理。使用正则表达式执行此操作是最慢且最容易出错的方法。

这是一个现成的解析器：codeproject.com: A Fast CSV Reader。其他示例很容易找到，因为实现 CSV 解析器是一种流行的练习。

您也可以使用 OLEDB 内置解析器：C# Tutorial - Using The Built In OLEDB CSV Parser。

以您的示例为例，我将使用IndexOf() 剪切"var matches = new Array(" 和");" 之间的字符串，并将结果视为CSV 字符串。

Answer 2

尝试以下方法：

using System.Text.RegularExpressions;

public static MatchCollection getMatches(String input, String pattern) {
   Regex re = new Regex(pattern);
   return re.Matches(input);
}

public static void Example() {
   String pattern1 = "var matches = new Array\\(([^\\)]+)\\)";

   MatchCollection results = getMatches(RandomTest, pattern1);
   String marray = results[0].Groups[1].Value;

   String pattern2 = "\"([^\"]+)\"";
   List<String> values = new List<String>();
   foreach (Match value in getMatches(marray,pattern2)) {
      //Your values are in the Groups property
      values.Add(value.Groups[1].Value);
      Console.WriteLine(value.Groups[1].Value);
   }
}

第一个模式提取匹配数组，第二个模式获取该数组中所有引用的值

Answer 3

我会使用以下正则表达式模式来匹配整个数组内容：

"var matches = new Array\(\s+(.*?)\s+\)"

... 然后在逗号分隔符上执行 String.Split。

Answer 4

我认为您需要删除开头和结尾的 " 并拆分为 ","

string [] test=Regex.Split(s.SubString(1,s.length-2), "\",\"");

Answer 5

如果你真的想使用正则表达式，试试这样：

var matches = new Array\(\s*("(?:[^\\"]*|\\.)*"\s*(?:,\s*"(?:[^\\"]*|\\.)*")*)\s*\);

这应该会为您提供数组值列表。然后另一个正则表达式可以为您获取单个值：

"(?:[^\\"]*|\\.)*"

但同样：在这种情况下使用正则表达式并不是那么有效。一个简单的 CSV 解析器会更好。

Answer 6

如果您需要将所有行放在一个列表中，请使用：

/// <returns>Returns all values inside matches array in a single list</returns>
        public static List<string> GetMatchesArray(String inputString)
        {
            // Matches var matches = new Array( ... );
            Regex r = new Regex("(var matches = new Array\\([^\\)]*\\);)",
                RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.Multiline);

            string arrayString = r.Match(inputString).Groups[0].Value;

            List<string> quotedList = new List<string>();

            // Matches all the data between the quotes inside var matches
            r = new Regex("\"([^\"]+)\"", RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.Multiline);
            for (Match m = r.Match(arrayString); m.Success; m = m.NextMatch())
            {
                quotedList.Add(m.Groups[1].Value);
            }

            return quotedList;
        }

如果你想每行有一个单独的列表，你应该有一个行列表，并且在每个列表中你应该有一个引用文本的列表。下面的代码将做到这一点：

/// This will help you store the data in a list in a more meaningful way, 
/// so that you are able to organize the data per line
/// Returns all the quoted text per line in a list of lines
public static List<List<string>> GetMatchesArrayPerLine(String inputString)
{
    // Matches var matches = new Array( ... )
    Regex r = new Regex("(var matches = new Array\\([^\\)]*\\);)",
        RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.Multiline);

    string arrayString = r.Match(inputString).Groups[0].Value;

    List<string> lineList = new List<string>();

    // Matches all the lines and stores them in lineList one line per item. For e.g.
    // "125","1.FC Nurnberg - TSV 1860 Munich", ...
    // "126","FC Ingolstadt 04 - TuS Koblenz", ...
    r = new Regex("\n(.*)", RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.Multiline);
    for (Match m = r.Match(arrayString); m.Success; m = m.NextMatch())
    {
        lineList.Add(m.Groups[1].Value);
    }

    List<List<string>> quotedListPerLine = new List<List<string>>();

    // Matches the quoted text per line. 
    // This will help you store data in an organised way rather than just a list of values
    // Similar to a 2D array
    // quotedListPerLine[0] = List<string> containing { "125", "1.FC Nurnberg - TSV 1860 Munich", ... }
    // quotedListPerLine[1] = List<string> containing { "126","FC Ingolstadt 04 - TuS Koblenz", ... }
    r = new Regex("\"([^\"]+)\"", RegexOptions.IgnoreCase | RegexOptions.Compiled);
    foreach (string line in lineList)
    {
        List<string> quotedList = new List<string>();
        for (Match m = r.Match(line); m.Success; m = m.NextMatch())
        {
            quotedList.Add(m.Groups[1].Value);
        }
        quotedListPerLine.Add(quotedList);
    }

    return quotedListPerLine;
}

为方便起见调用代码：

List<List<string>> quotedListLines = MyRegEx.GetMatchesArrayPerLine(a);
foreach (List<string> line in quotedListLines)
{
    Console.WriteLine("----LINE---");
    foreach (string quotedText in line)
        Console.WriteLine(quotedText);
}