也谈正则表达式

  // 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  =   @" ^(([^<>()[]/.,;:@ " + ' " ' + @"