使用c#编写的正则表达式练习软件

在.NET FRAMEWORK的教学过程中，出于教学需要，使用C#写了这样一个正则表达式练习器软件，可以通过输入正则表达式和待分析的文本，由软件给出解析结果，其中解析结果里包括了分组信息，界面如下：

 

核心代码：

using System; using System.Text; using System.Windows.Forms; using System.Text.RegularExpressions; using System.IO; namespace RegexTester { public partial class Form1 : Form { private const string resultCount = "发现 {0} 个"; private string text = ""; public Form1() { InitializeComponent(); } private void btnProcess_Click(object sender, EventArgs e) { if (!String.IsNullOrEmpty(cboReg.Text) && !String.IsNullOrEmpty(txtSrc.Text)) { StartProcess(); } else { MessageBox.Show("正则表达式和待处理字符串不能为空！", "正则表达式练习器", MessageBoxButtons.OK, MessageBoxIcon.Error); } } /// <summary> /// 使用选定的正则表达式对给定文字进行分析 /// </summary> private void StartProcess() { Regex myRegex; MatchCollection matches; string pattern = cboReg.Text.Trim(); string sourceText = txtSrc.Text.Trim(); String[] groups; StringBuilder result = new StringBuilder(); int foundItems = 0; try { myRegex = new Regex(@pattern, RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace); matches = myRegex.Matches(sourceText); foundItems = matches.Count; groups = chkGroup.Checked ? AnalyzeGroups(pattern) : myRegex.GetGroupNames(); int num = 1; foreach (Match match in matches) { result.Append(num++); result.Append(".索引："); result.Append(match.Index); result.Append("/t"); result.Append(match.ToString()); if (groups.Length > 0) { for (int i = 0; i < groups.Length; i++) { result.Append("/r/n - 【"); result.Append(groups[i]); result.Append("】："); result.Append(match.Groups[groups[i]].Value); } } else { result.Append("/t【无分组信息】"); } result.Append("/r/n"); } } catch { MessageBox.Show("正则表达式错误，请检查！", "正则表达式练习器", MessageBoxButtons.OK, MessageBoxIcon.Error); } finally { myRegex = null; matches = null; } txtResult.Text = result.ToString(); lblResult.Text = string.Format(resultCount, foundItems); } /// <summary> /// 分析正则表达式中的组 /// </summary> /// <param name="pattern"></param> /// <returns></returns> private static string[] AnalyzeGroups(string pattern) { const string groupPattern = @"/</D*/>"; Regex myRegex; MatchCollection matches; try { myRegex = new Regex(groupPattern, RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace); matches = myRegex.Matches(pattern); string[] result = new string[matches.Count]; int i = 0; foreach (Match match in matches) { string group = match.ToString(); result[i] = group.Substring(1, group.Length - 2); i++; } return result; } finally { myRegex = null; matches = null; } } private void Form1_Load(object sender, EventArgs e) { lblResult.Text = string.Format(resultCount, 0); } private void cboReg_SelectedIndexChanged(object sender, EventArgs e) { switch (cboReg.SelectedIndex) { case 0: txtSrc.Text = "腾中重工拟投资8至20亿美元经营悍马品牌,/r/n据悉，按照我国的《境外投资管理办法》，1亿美元及以上的境外投资需要商务部审批。鉴于此，通用和腾中均表示，虽然双方已签署最终协议，但交易的最终完成还须等待中国和美国政府主管部门的审批。"; break; case 1: txtSrc.Text = "﹣你所不知道的“战神”：155毫米加榴炮内部/r/n﹣中国新型155mm制导炮弹：20千米一发击毁坦克"; break; case 2: txtSrc.Text = "公司名：微软公司，/r/n联系电话：(111)111-1111,(123)456-7890。"; break; default: if (string.IsNullOrEmpty(text)) { text = LoadTextFromFile("webpage.html"); } txtSrc.Text = text; break; } } /// <summary> /// 从文件加载大文本数据 /// </summary> /// <param name="file"></param> /// <returns></returns> private static string LoadTextFromFile(string file) { FileStream stream = null; StreamReader reader = null; String txtContent = ""; try { stream = File.Open(file, FileMode.Open, FileAccess.Read); reader = new StreamReader(stream, Encoding.GetEncoding("gb2312")); txtContent = reader.ReadToEnd(); } catch { MessageBox.Show("读取文件错误！", "正则表达式练习器", MessageBoxButtons.OK, MessageBoxIcon.Error); } finally { if (stream != null) { if (stream.CanRead) { stream.Close(); stream.Dispose(); } stream = null; } if (reader != null) { reader.Close(); reader.Dispose(); reader = null; } } return txtContent; } } }   

工程下载（Visual Studio 2008工程）：

http://61.dc.ftn.qq.com/ftn_handler/e2c4956e7c666a884df97296e753544c9f6295d5ff61265a5f2dca70c1475cc3cbda3e2cf7fff0c0be9edfb899a99e51173ef2b82af463ea9bfe257ac442b301/RegexTester.rar?k=27326163ca7d9a9c84056d634366574c54510501525e065049515351554b515b52534c5a5053574e5c0758500750075106010453656965310155041b3103161701404f11041465