c# -拆分包含电子邮件Id的字符串将截断电子邮件的最后3个字符

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;

class Program
{
    static void Main()
    {
        string input = "user1@example.com,user2@example.org,user3@example.net";
        List<string> truncatedEmails = TruncateLastThreeChars(input);

        foreach (string email in truncatedEmails)
        {
            Console.WriteLine(email);
        }
    }

    static List<string> TruncateLastThreeChars(string input)
    {
        List<string> emails = new List<string>();
        Regex regex = new Regex(@"[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}");

        MatchCollection matches = regex.Matches(input);
        foreach (Match match in matches)
        {
            string email = match.Value;
            if (email.Length > 3)
            {
                email = email.Substring(0, email.Length - 3);
            }
            emails.Add(email);
        }

        return emails;
    }
}