也谈正则表达式

    其实很早就知道了正则表达式，在集成VBScript脚本的时候，就看到了该功能，不过那时觉得很难，觉得也派不上什么用场，所以也没有过多关注。

最近看了 孟岩 老师的关于正则表达式讲解，有一种学习正则表达式的冲动，适时我们开发的项目中需要嵌入Python脚本功能，需要一个脚本编辑器，关键字变色等等相关功能用正则表达式实现相对容易的多。

前段时间买了本红皮书《C#字符串和正则表达式参考书》（这真是一本好书，想学习正则表达式的可以参考一下），花了几天的时间把该书看了一遍，正则表达式的用法基本上也弄清楚了，并且对字符串相关的知识也越来越感兴趣了。

对正则表达式的具体规则和使用，实没有什么可说的，网上的文章多的很，都说的比我的好。这是我学习正则表达式做的一个简单正则表达式测试工具，其实大部分代码就是上面书的一个示例（不知道为什么，上网竟没有找到该书的示例源码），又上网查了一些资料，把一些常见的正则表达式也嵌入了进去，方便了正则表达式的应用（以后有时间做一个比较理想的正则表达式工具）。

这是程序的截图：

 

 

 

相关源码：

  // 获取正则表达式的匹配参数
         private  RegexOptions GetSelectedRegexOptions()
        {
            RegexOptions selectedRegexOptions  =  RegexOptions.None;

             if  ( this .IgnoreCaseChkBox.Checked)
                selectedRegexOptions  |=  RegexOptions.IgnoreCase;
             if  ( this .ExplicitCaptureChkBox.Checked)
                selectedRegexOptions  |=  RegexOptions.ExplicitCapture;
             if  ( this .ECMAScriptChkBox.Checked)
                selectedRegexOptions  |=  RegexOptions.ECMAScript;
             if  ( this .IgnoreCaseChkBox.Checked)
                selectedRegexOptions  |=  RegexOptions.IgnoreCase;
             if  ( this .MultiLineChkBox.Checked)
                selectedRegexOptions  |=  RegexOptions.Multiline;
             if  ( this .RightToLeftChkBox.Checked)
                selectedRegexOptions  |=  RegexOptions.RightToLeft;
             if  ( this .SingeLineChkBox.Checked)
                selectedRegexOptions  |=  RegexOptions.Singleline;
             return  selectedRegexOptions;

        }

         private   void  TestRegexButton_Click( object  sender, EventArgs e)
        {
             try
            {
                RegexOptions selectedRegexOptions  =   this .GetSelectedRegexOptions();
                Regex testRegex  =   new  Regex( this .RegexTextBox.Text, selectedRegexOptions);
                 if  (testRegex.IsMatch( this .InputTextBox.Text))
                {
                     this .ResultsTextBox.ForeColor  =  Color.Black;
                     this .ResultsTextBox.Text  =   " 匹配成功 " ;
                }
                 else
                {
                     this .ResultsTextBox.ForeColor  =  Color.Red;
                     this .ResultsTextBox.Text  =   " 匹配失败 " ;
                }
            }
             catch  (ArgumentException ex)
            {
                 this .ResultsTextBox.ForeColor  =  Color.Red;
                 this .ResultsTextBox.Text  =   " 错误： " + ex.Message;
            }
        }

         private   void  ReplaceButton_Click( object  sender, EventArgs e)
        {
             try
            {
                RegexOptions selectedRegexOptions  =   this .GetSelectedRegexOptions();
                Regex replaceRegex  =   new  Regex( this .RegexTextBox.Text, selectedRegexOptions);

                 this .ResultsTextBox.ForeColor  =  Color.Black;
                 this .ResultsTextBox.Text  =  replaceRegex.Replace( this .InputTextBox.Text,  this .ReplacementTextBox.Text);
                              
            }
             catch  (ArgumentException ex)
            {
                 this .ResultsTextBox.ForeColor  =  Color.Red;
                 this .ResultsTextBox.Text  =   " 错误： "   +  ex.Message;
            }
        }

         private   void  SplitBoutton_Click( object  sender, EventArgs e)
        {
             try
            {
                RegexOptions selectedRegexOptions  =   this .GetSelectedRegexOptions();
                Regex splitRegex  =   new  Regex( this .RegexTextBox.Text, selectedRegexOptions);

                String[] splitResults;
                splitResults  =  splitRegex.Split( this .InputTextBox.Text);
                StringBuilder resultsString  =   new  StringBuilder( this .InputTextBox.Text.Length);

                 foreach  (String stringElement  in  splitResults)
                    resultsString.Append(stringElement  +  Environment.NewLine);

                 this .ResultsTextBox.ForeColor  =  Color.Black;
                 this .ResultsTextBox.Text  =  resultsString.ToString();
            }
             catch  (ArgumentException ex)
            {
                 this .ResultsTextBox.ForeColor  =  Color.Red;
                 this .ResultsTextBox.Text  =   " 错误： "   +  ex.Message;
            }            

        }

         private   void  MatchesButton_Click( object  sender, EventArgs e)
        {
             try
            {
                RegexOptions selectedRegexOptions  =   this .GetSelectedRegexOptions();
                Regex matchesRegex  =   new  Regex( this .RegexTextBox.Text, selectedRegexOptions);

                MatchCollection matchesFound;
                matchesFound  =  matchesRegex.Matches( this .InputTextBox.Text);

                String nextMath  =   " ------- 下一个匹配项 ---------- " ;
                StringBuilder resultsString  =   new  StringBuilder( 64 );

                 foreach (Match matchMode  in  matchesFound)
                    resultsString.Append(matchMode.Value  + (Environment.NewLine + nextMath));

                 this .ResultsTextBox.ForeColor  =  Color.Black;
                 this .ResultsTextBox.Text  =  resultsString.ToString();
            }
             catch  (ArgumentException ex)
            {
                 this .ResultsTextBox.ForeColor  =  Color.Red;
                 this .ResultsTextBox.Text  =   " 错误： "   +  ex.Message;
            }            

        }

         private   void  GroupsButton_Click( object  sender, EventArgs e)
        {
             try
            {
                RegexOptions selectedRegexOptions  =   this .GetSelectedRegexOptions();
                Regex matchesRegex  =   new  Regex( this .RegexTextBox.Text, selectedRegexOptions);

                MatchCollection matchesFound;
                matchesFound  =  matchesRegex.Matches( this .InputTextBox.Text);

                String nextMath  =   " ------- 下一个分组 ---------- " ;
                StringBuilder resultsString  =   new  StringBuilder( 64 );
                GroupCollection matchGroups;


                 foreach  (Match matchMode  in  matchesFound)
                {
                    matchGroups  =  matchMode.Groups;
                     foreach  (Group matchGroup  in  matchGroups)
                        resultsString.Append( " ( "   +  matchGroup.Value  +   " ) " );
                    resultsString.Append(Environment.NewLine  +  nextMath);
                }

                 this .ResultsTextBox.ForeColor  =  Color.Black;
                 this .ResultsTextBox.Text  =  resultsString.ToString();
            }
             catch  (ArgumentException ex)
            {
                 this .ResultsTextBox.ForeColor  =  Color.Red;
                 this .ResultsTextBox.Text  =   " 错误： "   +  ex.Message;
            }           
        }

         // 常见正则表达式
         private   void  FamiliarRegex_LinkClicked( object  sender, LinkLabelLinkClickedEventArgs e)
        {
            MenuRegex.Show( this , new  Point(FamiliarRegex.Location.X, FamiliarRegex.Location.Y  +  FamiliarRegex.Size.Height));  
             // MessageBox.Show("sdfsd");
        }

         private   void  MenuRegexItem_Click( object  sender, EventArgs e)
        {
             string  strRegex  =   "" ;
             switch  (((ToolStripMenuItem)sender).Text)
            {
                 case   " 整数 " :
                    strRegex  =   @" ^((+|-)d)?d*$ " ;
                     break ;
                 case   " 浮点数 " :
                    strRegex  =   @" ^(?:+|-)?d+(?:.d+)?$ " ;
                     break ;
                 case   " 电话号码 " :
                    strRegex  =   @" d{3}-d{8}|d{4}-d{7} " ;
                     break ;
                 case   " 邮政编码 " :
                    strRegex  =   @" [1-9]d{5}(?!d) " ;
                     break ;
                 case   " Email地址1 " :
                    strRegex  =   @" ^(([^<>()[]/.,;:@ " + ' " ' + @"

 

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