正则表达式点滴(2)-白红宇的个人博客

正则表达式点滴(2)

发布日期：2021-05-14 04:37:35 浏览次数：18 分类：博客文章

本文共 13166 字，大约阅读时间需要 43 分钟。

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Text.RegularExpressions; using System.Drawing; namespace RegularExpressionConsoleApplication {     class Program     {                static void Main(string[] args)         {             //LoopBackMatch();  //������������(������������������)             //LoopForwardMatch(); //������������(?=)             //LoopAfterwardMatch(); //������������(?<=)             //LoopForwardAndAfterwardMatch(); //������������������������             ConditionItems(); //���������������������������         }         ///          /// ������������         /// 
         static void LoopForwardMatch()         {             string text = " http://www.cnblogs.com";             string expression = @".+(?=:)";             Regex reg = new Regex(expression, RegexOptions.IgnoreCase);             MatchCollection mc = reg.Matches(text);             foreach (Match match in mc)             {                 Console.WriteLine(match.Value);             }             Console.ReadKey();         }         ///          /// ������������         /// 
         static void LoopAfterwardMatch()         {             string text = "ABC01: $12.56";             string expression = @"(?<=\$)[0-9.]+";             Regex reg = new Regex(expression, RegexOptions.IgnoreCase);             MatchCollection mc = reg.Matches(text);             foreach (Match match in mc)             {                 Console.WriteLine(match.Value);             }             Console.ReadKey();         }         ///          /// ������������������������         /// 
         static void LoopForwardAndAfterwardMatch()         {             StringBuilder sbStr = new StringBuilder();             sbStr.Append("");             sbStr.Append("\r\n ");             sbStr.Append("Ben Forta's HomePage");             sbStr.Append("\r\n");             sbStr.Append("");             string expression = @"(?<=).*?(?=)";             Regex reg = new Regex(expression, RegexOptions.IgnoreCase);             MatchCollection mc = reg.Matches(sbStr.ToString());             foreach (Match match in mc)             {                 Console.WriteLine(match.Value);             }             Console.ReadKey();         }         ///          /// ���������������������������������������         /// 
         ///          static void LoopBackMatch()         {             string text = " this is  is a text, and I want to know   know if there is any repeated words in it.";             string expression = @"[ ]+(\w+)[ ]+\1";             Regex reg = new Regex(expression, RegexOptions.IgnoreCase);             MatchCollection mc = reg.Matches(text);             foreach (Match match in mc)             {                 Console.WriteLine(match.Value);             }             Console.ReadKey();         }         ///          /// ������������,���������������������:         /*********************************************************          * 
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         static void ConditionItems()         {             StringBuilder text = new StringBuilder();             text.Append("
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       ]+>(?(1)\s*)";             Regex reg = new Regex(expression, RegexOptions.IgnoreCase);             MatchCollection mc = reg.Matches(text.ToString());             //foreach (Match match in mc)             //{             //    Console.WriteLine(match.Value);             //}             Console.ForegroundColor = ConsoleColor.Yellow;             Console.WriteLine("the total count of match result is: " + mc.Count);                         for (int i = 0; i < mc.Count; i++)             {                 Match match = mc[i];                 Console.ForegroundColor = ConsoleColor.Red;                                 Console.WriteLine("|-Match["+i+"] is :"+match.Value);                                 GroupCollection groups = match.Groups;                 for (int j = 0; j < groups.Count; j++)                 {                     Console.ForegroundColor = ConsoleColor.DarkGreen;                     Console.WriteLine("|---Groups[" + j + "] is :" + groups[j]);                 }             }             Console.ReadKey();         }     } }

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