Question

我已经看到了一些线程，并尝试了其中提供的解决方案，但我似乎无法解决这个问题。我有一个正则表达式，以mm/dd/yyyy , mm/dd/yyyy格式检查两个日期。中间可以有任意数量的空格。我的表达式适用于http://regexr.com/，但是当我在VS中运行代码时，正则表达式检查始终为false。任何帮助将不胜感激！

        var reg = new Regex(@"\d{1,2}\/\d{1,2}\/\d{1,4}[ ]{0,}\,[ ]{0,}\d{1,2}\/\d{1,2}\/\d{1,4}");

        Console.WriteLine("Please enter two dates in dd/mm/yyyy format seperated by a comma");
        string datesIn = Console.ReadLine();

        while (reg.IsMatch(datesIn) != true);
        {
            Console.WriteLine("Sorry, please make sure to enter your dates in dd/mm/yyyy format seperated by a comma.");
            datesIn.Replace(datesIn, Console.ReadLine());
        }

        String[] dates = datesIn.Split(',');

        foreach (var date in dates)
            Console.WriteLine(date.Trim());
        Console.ReadLine();

Answer 1

我强烈建议您使用TryParse

让.NET为您完成这项工作

using System;
using System.Globalization;

public class Program
{
    public static void Main()
    {
        var input = "12/10/2012, 12/15/2015";
        String[] dates = input.Split(',');

        if(dates.Length != 2){
            Console.WriteLine("I said 2 dates");
        } else {
            foreach (var date in dates)
            {
                DateTime parsedDate;
                if(DateTime.TryParse(date, new CultureInfo("es"), DateTimeStyles.None, out parsedDate))
                {
                    Console.WriteLine("{0} Perfect!", parsedDate);
                }
                else 
                {
                    Console.WriteLine("{0} Not right sir!", date);
                }
            }
        }

        Console.ReadLine();
    }
}

源代码：https://dotnetfiddle.net/VGEQuM

正则表达式适用于正则表达式构建器，但不适用于C＃

1 个答案: