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HomeBackend DevelopmentC#.Net TutorialCommon methods of regular expression Regex class

Common methods of regular expression Regex class

Feb 25, 2017 am 11:24 AM
c#regular expression

1、 IsMatch()方法,IsMatch()方法实际上是一个返回Bool值得方法,如果测试字符满足正则表达式返回True否则返回False。

例子:

//匹配的正则表达式,去掉@不影响效果
Regex r = new Regex(@"^[0-9]");
//开始匹配
Match m = r.Match(this.textBox1.Text);
while (m.Success)
{
       MessageBox.Show("首位是数字");
       return;
}


检测textBox1中输入的值,首位是不是数字。

小注:

1、IsMatch()方法;IsMatch()方法实际上是一个返回Bool值得方法,如果测试字符满足正则表达式返回True否则返回False。

2、@符是用来原样输出的@"",两个引号中间的内容会原样输出,不管其中有什么特殊符号。

2、Replace()方法,Replace()方法实际上是一种替换的方法,替换匹配正则表达式匹配模式。

例子:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
namespace TestRegularExpressions
{
    class Program
    {
        static void Main(string[] args)
       {
            string RegularText = "\\w{1,}@\\w{1,}\\.";
            string groupEmail = "111@126.com";
            if (Regex.IsMatch(groupEmail,RegularText))
            {
                Console.WriteLine(Regex.Replace(groupEmail, "@", "==="));
            }
            else
            {
                Console.WriteLine("未匹配成功!");
            }
            Console.ReadKey();
        }
    }
}

输出:

3、Split()方法,Split()方法实际上是拆分的方法,根据匹配正则表达式进行拆分储存在字符串数组中。

例子:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
namespace TestRegularExpressions
{
    class Program
    {
        static void Main(string[] args)
        {
            string RegularText = ";";
            string groupEmail = "111@126.com;222@126.com;333@126.com;444@126.com;";
            string[] Email;
            Email = Regex.Split(groupEmail, RegularText);
            foreach (string personEmail in Email)
            {
                Console.WriteLine(personEmail);
            }
            Console.ReadKey();
        }
    }
}

输出:

小注:

        对于string即字符串,可以使用String.Split 方法,效果一样。例如,去除vsNt中的英文,代码如下:

string[] Au=vsNt.Split(',');

        函数具体细节:点击打开链接

Split函数小封装:

        #region 根据pattern拆分字符串
        /// <summary>
        /// 根据pattern拆分字符串
        /// </summary>
        /// <param name="input">待拆分的字符串</param>
        /// <param name="pattern">拆分标识符</param>
        /// <returns>拆分后数组</returns>
        private string[] SplitString(string input, string pattern)
        {
            string[] Email;
            Email = Regex.Split(input, pattern);
            return Email;
        }
        #endregion

 以上就是正则表达式Regex类常用方法 的内容,更多相关内容请关注PHP中文网(www.php.cn)!


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