C＃和正则表达式：如何在引号之间提取字符串

Question

假设我有以下字符串：

<script language="javascript">
        var league = new Array(
            "Soccer","Germany - 2. Bundesliga","38542195","102","24 May 2009 14:00","24 May 2009 14:00","1X2","1","0"
        );
        var matches = new Array(
            "125","1.FC Nurnberg - TSV 1860 Munich","24 May 2009 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","24 May 2009 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 Frankfurt","24 May 2009 14:00","Sun, 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","24 May 2009 14:00","Sun, 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 Mainz 05 - SC Rot-Weiss Oberhausen","24 May 2009 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","24 May 2009 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","24 May 2009 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","24 May 2009 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","24 May 2009 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(league, matches);
        hasEvents = hasEvents + events;
</script>

我想做的是解析它读取“ var match”的部分，并提取两个引号之间包含的所有内容。 因此，所需结果应为包含以下内容的数组：

(0): 125
(1): 1.FC Nurnberg - TSV 1860 Munich
(2): 24 May 2009 14:00 
etc.

NB：我看到一个类似的问题正在回答，但是花了一段时间后我还是无法使它起作用。 谢谢！

Answer 1

请不要为此使用正则表达式，CSV应该由解析器处理。 使用正则表达式执行此操作是所有方法中最慢且最容易出错的方法。

这是一个现成的解析器： codeproject.com：快速CSV阅读器 。 可以很容易找到其他示例，因为实现CSV解析器是一种很流行的练习。

您还可以使用OLEDB内置解析器： C＃教程-使用内置OLEDB CSV解析器 。

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

Answer 2

请尝试以下操作：

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matchs数组，第二个模式获取该数组中所有引用的值

Answer 3

我将使用以下正则表达式模式来匹配整个Array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“，然后用”，“

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

Answer 5

如果您真的想使用正则表达式，请尝试以下操作：

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

那应该得到数组值列表。 然后另一个正则表达式可以为您提供单个值：

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

但是再说一遍：在这种情况下使用正则表达式不是那么有效。 一个简单的CSV解析器会更好。

Answer 6

如果所有行都需要一个列表，请使用以下命令：

/// <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;
        }

如果希望每行有一个单独的列表，则应该有一个行列表，并且在每个列表中都应该有一个带引号的文本列表。 下面的代码可以做到这一点：

/// 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);
}