C#-正则基础 [0-9]{3} 匹配3个连续的数字

•  .NET Framework : 4.7.2
•        IDE : Visual Studio Community 2019
•         OS : Windows 10 x64
•     typesetting : Markdown
•         blog : xinshaopu.blog.csdn.net

code

using System;
using System.Text.RegularExpressions;

namespace ConsoleApp
{

    class Program
    {
        static void Main(string[] args)
        {
            string regularExpression = "[0-9]{3}";
            Regex rg = new Regex(regularExpression);

            string[] contents = { "12", "123aa", "a3bb12345", "a3bb123456" };
            for (int i = 0; i < contents.Length; i++)
            {
                if (rg.IsMatch(contents[i]))
                {
                    Console.WriteLine(contents[i] + "成功");
                }
                else
                {
                    Console.WriteLine(contents[i] + "不成功");

                }
            }

            Console.ReadKey();
        }
    }
}

result

12不成功
123aa成功
a3bb12345成功
a3bb123456成功

resource

• [文档] docs.microsoft.com/zh-cn/dotnet/csharp
• [规范] github.com/dotnet/docs/tree/master/docs/standard/design-guidelines
• [平台] regexr.com
• [文档] www.runoob.com/regexp/regexp-tutorial.html
• [源码] referencesource.microsoft.com
• [ IDE ] visualstudio.microsoft.com/zh-hans
• [.NET Core] dotnet.github.io