Return 单个正则表达式匹配的命名捕获组名称和值

Question

我有这个 Tokinizer Class 可以分解字符串输入：

    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");
            }            
        }

我想打印出捕获组的名称以及匹配列表中的值，这可以吗？

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;
            }
        } 
    }
}

Return 单个正则表达式匹配的命名捕获组名称和值

Return a single regex match's Named Capture Group name and value

c#

regex

named-captures