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