c# - 如何在正则表达式中留出空间？

Question

我试图在 New : 双引号后获取值。当 ListName 中没有空格时，我可以很好地检索值。但是如果我在列表名称之间放置空格(例如 NewFinancial History:\"xyz\")，它会抛出以下错误:

parsing "NewFinancial History:"(?[^"]*)"" - Invalid group name: Group names must begin with a word character.

它在下一行抛出错误var matches = Regex.Matches(contents, regex, RegexOptions.Singleline);

下面是我的代码。

string contents = " testing NewFinancial History:\"xyz\"   ";
var keys = Regex.Matches(contents, @"New(.+?):", RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace).OfType<Match>().Select(m => m.Groups[0].Value.Trim().Replace(":", "")).Distinct().ToArray();

foreach (string key in keys)
{
    List<string> valueList = new List<string>();
    string listNameKey = key;
    string regex = "" + listNameKey + ":" + "\"(?<" + listNameKey + ">[^\"]*)\"";

    var matches = Regex.Matches(contents, regex, RegexOptions.Singleline);
    foreach (Match match in matches)
    {
        if (match.Success)
        {                    
            string value = match.Groups[key].Value;
            valueList.Add(value);
        }            
    }
}

Answer 1

我不明白你为什么还要使用“key”作为组名。

你的问题是组名不能包含空格，但您可以简单地创建一个匿名组。

string contents = " testing NewFinancial History:\"xyz\"   ";
var keys = Regex.Matches(contents, @"New(.+?):", RegexOptions.Singleline | RegexOptions.IgnorePatternWhitespace).OfType<Match>().Select(m => m.Groups[0].Value.Trim().Replace(":", "")).Distinct().ToArray();

foreach (string key in keys)
{
    List<string> valueList = new List<string>();
    string listNameKey = key;
    string regex = "" + listNameKey + ":" + "\"([^\"]*)\"";  //create an anonymous capture group

    var matches = Regex.Matches(contents, regex, RegexOptions.Singleline);
    foreach (Match match in matches)
    {
        if (match.Success)
        {                    
            string value = match.Groups[0].Value; //get the first group
            valueList.Add(value);
        }            
    }
}