学步园

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;<br /> using System.Text;<br /> using System.Windows.Forms;<br /> using System.Text.RegularExpressions;<br /> using System.IO;</p> <p>namespace RegexTester<br /> {<br /> public partial class Form1 : Form<br /> {<br /> private const string resultCount = "发现 {0} 个";<br /> private string text = "";</p> <p> public Form1()<br /> {<br /> InitializeComponent();<br /> }</p> <p> private void btnProcess_Click(object sender, EventArgs e)<br /> {<br /> if (!String.IsNullOrEmpty(cboReg.Text) && !String.IsNullOrEmpty(txtSrc.Text))<br /> {<br /> StartProcess();<br /> }<br /> else<br /> {<br /> 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);<br /> }<br /> }</p> <p> /// <summary><br /> /// 使用选定的正则表达式对给定文字进行分析<br /> /// </summary><br /> private void StartProcess()<br /> {<br /> Regex myRegex;<br /> MatchCollection matches;<br /> string pattern = cboReg.Text.Trim();<br /> string sourceText = txtSrc.Text.Trim();</p> <p> String[] groups;</p> <p> StringBuilder result = new StringBuilder();</p> <p> int foundItems = 0;</p> <p> try<br /> {<br /> myRegex = new Regex(@pattern, RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);<br /> matches = myRegex.Matches(sourceText);<br /> foundItems = matches.Count;<br /> groups = chkGroup.Checked ? AnalyzeGroups(pattern) : myRegex.GetGroupNames();<br /> int num = 1;<br /> foreach (Match match in matches)<br /> {<br /> result.Append(num++);<br /> result.Append(".索引：");<br /> result.Append(match.Index);<br /> result.Append("/t");<br /> result.Append(match.ToString());<br /> if (groups.Length > 0)<br /> {<br /> for (int i = 0; i < groups.Length; i++)<br /> {<br /> result.Append("/r/n - 【");<br /> result.Append(groups[i]);<br /> result.Append("】：");<br /> result.Append(match.Groups[groups[i]].Value);<br /> }<br /> }<br /> else<br /> {<br /> result.Append("/t【无分组信息】");<br /> }<br /> result.Append("/r/n");<br /> }<br /> }<br /> catch<br /> {<br /> MessageBox.Show("正则表达式错误，请检查！", "正则表达式练习器", MessageBoxButtons.OK, MessageBoxIcon.Error);<br /> }<br /> finally<br /> {<br /> myRegex = null;<br /> matches = null;<br /> }</p> <p> txtResult.Text = result.ToString();<br /> lblResult.Text = string.Format(resultCount, foundItems);<br /> }</p> <p> /// <summary><br /> /// 分析正则表达式中的组<br /> /// </summary><br /> /// <param name="pattern"></param><br /> /// <returns></returns><br /> private static string[] AnalyzeGroups(string pattern)<br /> {<br /> const string groupPattern = @"/</D*/>";<br /> Regex myRegex;<br /> MatchCollection matches;</p> <p> try<br /> {<br /> myRegex = new Regex(groupPattern, RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);<br /> matches = myRegex.Matches(pattern);</p> <p> string[] result = new string[matches.Count];</p> <p> int i = 0;<br /> foreach (Match match in matches)<br /> {<br /> string group = match.ToString();<br /> result[i] = group.Substring(1, group.Length - 2);<br /> i++;<br /> }<br /> return result;<br /> }<br /> finally<br /> {<br /> myRegex = null;<br /> matches = null;<br /> }<br /> }</p> <p> private void Form1_Load(object sender, EventArgs e)<br /> {<br /> lblResult.Text = string.Format(resultCount, 0);<br /> }</p> <p> private void cboReg_SelectedIndexChanged(object sender, EventArgs e)<br /> {<br /> switch (cboReg.SelectedIndex)<br /> {<br /> case 0:<br /> txtSrc.Text =<br /> "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。";<br /> break;<br /> case 1:<br /> 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";<br /> break;<br /> case 2:<br /> txtSrc.Text = "公司名：微软公司，/r/n联系电话：(111)111-1111,(123)456-7890。";<br /> break;<br /> default:<br /> if (string.IsNullOrEmpty(text))<br /> {<br /> text = LoadTextFromFile("webpage.html");<br /> }<br /> txtSrc.Text = text;<br /> break;<br /> }<br /> }</p> <p> /// <summary><br /> /// 从文件加载大文本数据<br /> /// </summary><br /> /// <param name="file"></param><br /> /// <returns></returns><br /> private static string LoadTextFromFile(string file)<br /> {<br /> FileStream stream = null;<br /> StreamReader reader = null;<br /> String txtContent = "";<br /> try<br /> {<br /> stream = File.Open(file, FileMode.Open, FileAccess.Read);<br /> reader = new StreamReader(stream, Encoding.GetEncoding("gb2312"));<br /> txtContent = reader.ReadToEnd();<br /> }<br /> catch<br /> {<br /> MessageBox.Show("读取文件错误！", "正则表达式练习器", MessageBoxButtons.OK, MessageBoxIcon.Error);<br /> }<br /> finally<br /> {<br /> if (stream != null)<br /> {<br /> if (stream.CanRead)<br /> {<br /> stream.Close();<br /> stream.Dispose();<br /> }<br /> stream = null;<br /> }<br /> if (reader != null)<br /> {<br /> reader.Close();<br /> reader.Dispose();<br /> reader = null;<br /> }<br /> }<br /> return txtContent;<br /> }<br /> }<br /> }</p> <p>  

工程下载（Visual Studio 2008工程）：

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