c# - 返回单个正则表达式匹配的命名捕获组名称和值

Question

我有这个分解字符串输入的 Tokinizer 类：

    public class Tokinizer
    {
        public static Regex r = new Regex(
            "(?<Equals>=)" +
            "|(?<Plus>\\+)" +
            "|(?<Minus>\\-)" +
            "|(?<Divide>\\/)" +
            "|(?<Multiply>\\*)" +
            "|(?<Exclamation>\\!)" +
            "|(?<GreaterThan>\\>)" +
            "|(?<SmallerThan>\\<)" +
            "|(?<OpenParenthesis>\\()" +
            "|(?<CloseParenthesis>\\))" +
            "|(?<OpenBracket>\\[)" +
            "|(?<CloseBracket>\\])" +
            "|(?<OpenBrace>\\{)" +
            "|(?<CloseBrace>\\})" +
            "|(?<Colon>\\:)" +
            "|(?<SemiColon>\\;)" +
            "|(?<Comma>\\,)" +
            "|(?<FullStop>\\.)" +
            "|(?<Quatation>\\\")" +
            "|(?<Char>[a-zA-Z0-9])" +
            "|(?<space>\\s+)", RegexOptions.ExplicitCapture);

        public static void GetTokens(string input)
        {            
            foreach (var t in r.Matches(input))
            {
                Console.WriteLine("Named Group : Token Value");
            }            
        }

我想打印捕获组的名称以及匹配列表中的值，这可能吗？

例如，当我输入“var++”时，它应该输出：

Char : v
Char : a
Char : r
Plus : +
Plus : +

Answer 1

您可以使用Regex.GroupNameFromNumber

public static void GetTokens(string input)
{
    foreach (Match match in r.Matches(input))
    {
        for (int i = 1; i < match.Groups.Count; i++)
        {
            var group = match.Groups[i];
            if (group.Success){
                Console.WriteLine("{0} : {1}", r.GroupNameFromNumber(i), match);
                break;
            }
        } 
    }
}