本文實例講述了WinForm使用正則表達式提取內容的方法。分享給大家供大家參考，具體如下：
用VS新建WinForm程序，窗體上是三個文本框和一個按鈕。
可以自己構造正則表達式，自己修改匹配內容
正則表達是要提取的部分為hewenqitext
代碼如下：
using System;using System.Text.RegularExpressions;using System.Windows.Forms;namespace HoverTreeBatch.HoverTree{public partial class RegexForm : Form{public RegexForm(){InitializeComponent();textBox_regex.Text = @"<img/b[^<>]*?/bsrc[/s/t/r/n]*=[/s/t/r/n]*[""']?[/s/t/r/n]*(?<hewenqitext>[^/s/t/r/n""'<>]*)[^<>]*?/?[/s/t/r/n]*>";textBox_content.Text = @"<div class=""dengxaing-hovertree-com""><a title=""批量2"" href=""http://localhost/hvtimg/201601/p3t2ldyr.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201601/p3t2ldyr_l.png"" style=""width:180px;height:140px;"" /></a><a title=""VS2015開發人員命令提示查看PublicKeyToken(公鑰標記)"" href=""http://localhost/hvtimg/201601/wn0bamxp.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201601/wn0bamxp_l.png"" style=""width:180px;height:140px;"" /></a><a title=""消滅僵尸游戲"" href=""http://localhost/hvtimg/201601/q47add2k.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201601/q47add2k_l.jpg"" style=""width:180px;height:140px;"" /></a><a title=""純CSS3漂亮的房子不錯的天氣"" href=""http://localhost/hvtimg/201601/lbau8hqb.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201601/lbau8hqb_l.png"" style=""width:180px;height:140px;"" /></a><a title=""HoverClock"" href=""http://localhost/hvtimg/201601/thbniyjx.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201601/thbniyjx_l.png"" style=""width:180px;height:140px;"" /></a><a title=""javascript元旦倒計時特效"" href=""http://localhost/hvtimg/201512/o9qashmi.gif" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/o9qashmi_l.gif"" style=""width:180px;height:140px;"" /></a><a title=""下雨"" href=""http://localhost/hvtimg/201512/f748s0ko.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/f748s0ko_l.jpg"" style=""width:180px;height:140px;"" /></a><a title=""直接說喜歡你！"" href=""http://localhost/hvtimg/201512/vt1tf0xl.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/vt1tf0xl_l.jpg"" style=""width:180px;height:140px;"" /></a><a title=""IIS7，IIS7.5 URL重寫模塊工具"" href=""http://localhost/hvtimg/201512/ew4yb78b.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/ew4yb78b_l.png"" style=""width:180px;height:140px;"" /></a><a title=""山水畫"" href=""http://localhost/hvtimg/201512/agagq0or.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/agagq0or_l.jpg"" style=""width:180px;height:140px;"" /></a><a title=""劉德華"" href=""http://localhost/hvtimg/201512/r51a22uy.gif" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/r51a22uy_l.gif"" style=""width:180px;height:140px;"" /></a><a title=""IIS為網站設置域名"" href=""http://localhost/hvtimg/201512/69yoeuhf.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/69yoeuhf_l.jpg"" style=""width:180px;height:140px;"" /></a><a title=""HoverTreeCMS分成"" href=""http://localhost/hvtimg/201512/jgi94fdf.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/jgi94fdf_l.png"" style=""width:180px;height:140px;"" /></a><a title=""范冰冰"" href=""http://localhost/hvtimg/201511/6j9j6tk5.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201511/6j9j6tk5_l.png"" style=""width:180px;height:140px;"" /></a><a title=""周末愉快"" href=""http://localhost/hvtimg/201511/60mj4wsb.gif" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201511/60mj4wsb_l.gif"" style=""width:180px;height:140px;"" /></a><a title=""謝霆鋒手機背景圖"" href=""http://localhost/hvtimg/201508/cnvkv745.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201508/cnvkv745_l.jpg"" style=""width:180px;height:140px;"" /></a><a title=""現代舞舞蹈家瑪莎?葛蘭姆動畫Logo"" href=""http://localhost/hvtimg/201506/ufigfjvn.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201506/ufigfjvn_l.jpg"" style=""width:180px;height:140px;"" /></a><a title=""每次吵架，都希望男票這樣解決戰斗。。。"" href=""http://localhost/hvtimg/201506/iqoqrhfn.gif" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201506/iqoqrhfn_l.gif"" style=""width:180px;height:140px;"" /></a><a title=""現代舞舞蹈家瑪莎?葛蘭姆動畫Logo"" href=""http://localhost/hvtimg/201506/xlyxp4wg.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201506/xlyxp4wg_l.png"" style=""width:180px;height:140px;"" /></a><a title=""美女"" href=""http://localhost/hvtimg/201506/m921jw4n.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201506/m921jw4n_l.jpg"" style=""width:180px;height:140px;"" /></a></div>";}private void button_ok_Click(object sender, EventArgs e){Regex m_hvtRegImg = new Regex(textBox_regex.Text, RegexOptions.IgnoreCase);//搜索匹配的字符串MatchCollection hewenqi_matches;try{hewenqi_matches = m_hvtRegImg.Matches(textBox_content.Text);// 取得匹配項列表foreach (Match match in hewenqi_matches){textBox_result.Text = textBox_result.Text + match.Groups["hewenqitext"].Value + "/r/n";}}catch (Exception ex){textBox_result.Text = ex.ToString();}}}}/*<div class="dengxaing-hovertree-com"><a title="批量2" href=""http://localhost/hvtimg/201601/p3t2ldyr.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201601/p3t2ldyr_l.png"" style="width:180px;height:140px;" /></a><a title="VS2015開發人員命令提示查看PublicKeyToken(公鑰標記)" href=""http://localhost/hvtimg/201601/wn0bamxp.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201601/wn0bamxp_l.png"" style="width:180px;height:140px;" /></a><a title="消滅僵尸游戲" href=""http://localhost/hvtimg/201601/q47add2k.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201601/q47add2k_l.jpg"" style="width:180px;height:140px;" /></a><a title="純CSS3漂亮的房子不錯的天氣" href=""http://localhost/hvtimg/201601/lbau8hqb.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201601/lbau8hqb_l.png"" style="width:180px;height:140px;" /></a><a title="HoverClock" href=""http://localhost/hvtimg/201601/thbniyjx.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201601/thbniyjx_l.png"" style="width:180px;height:140px;" /></a><a title="javascript元旦倒計時特效" href=""http://localhost/hvtimg/201512/o9qashmi.gif" rel="external nofollow" rel="external nofollow" ><img src=""http://localhost/hvtimg/201512/o9qashmi_l.gif" style="width:180px;height:140px;" /></a><a title="下雨" href=""http://localhost/hvtimg/201512/f748s0ko.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/f748s0ko_l.jpg"" style="width:180px;height:140px;" /></a><a title="直接說喜歡你！" href=""http://localhost/hvtimg/201512/vt1tf0xl.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/vt1tf0xl_l.jpg"" style="width:180px;height:140px;" /></a><a title="IIS7，IIS7.5 URL重寫模塊工具" href=""http://localhost/hvtimg/201512/ew4yb78b.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/ew4yb78b_l.png"" style="width:180px;height:140px;" /></a><a title="山水畫" href=""http://localhost/hvtimg/201512/agagq0or.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/agagq0or_l.jpg"" style="width:180px;height:140px;" /></a><a title="劉德華" href=""http://localhost/hvtimg/201512/r51a22uy.gif" rel="external nofollow" rel="external nofollow" ><img src=""http://localhost/hvtimg/201512/r51a22uy_l.gif" style="width:180px;height:140px;" /></a><a title="IIS為網站設置域名" href=""http://localhost/hvtimg/201512/69yoeuhf.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/69yoeuhf_l.jpg"" style="width:180px;height:140px;" /></a><a title="HoverTreeCMS分成" href=""http://localhost/hvtimg/201512/jgi94fdf.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201512/jgi94fdf_l.png"" style="width:180px;height:140px;" /></a><a title="范冰冰" href=""http://localhost/hvtimg/201511/6j9j6tk5.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201511/6j9j6tk5_l.png"" style="width:180px;height:140px;" /></a><a title="周末愉快" href=""http://localhost/hvtimg/201511/60mj4wsb.gif" rel="external nofollow" rel="external nofollow" ><img src=""http://localhost/hvtimg/201511/60mj4wsb_l.gif" style="width:180px;height:140px;" /></a><a title="謝霆鋒手機背景圖" href=""http://localhost/hvtimg/201508/cnvkv745.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201508/cnvkv745_l.jpg"" style="width:180px;height:140px;" /></a><a title="現代舞舞蹈家瑪莎?葛蘭姆動畫Logo" href=""http://localhost/hvtimg/201506/ufigfjvn.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201506/ufigfjvn_l.jpg"" style="width:180px;height:140px;" /></a><a title="每次吵架，都希望男票這樣解決戰斗。。。" href=""http://localhost/hvtimg/201506/iqoqrhfn.gif" rel="external nofollow" rel="external nofollow" ><img src=""http://localhost/hvtimg/201506/iqoqrhfn_l.gif" style="width:180px;height:140px;" /></a><a title="現代舞舞蹈家瑪莎?葛蘭姆動畫Logo" href=""http://localhost/hvtimg/201506/xlyxp4wg.png" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201506/xlyxp4wg_l.png"" style="width:180px;height:140px;" /></a><a title="美女" href=""http://localhost/hvtimg/201506/m921jw4n.jpg" rel="external nofollow" rel="external nofollow" "><img src=""http://localhost/hvtimg/201506/m921jw4n_l.jpg"" style="width:180px;height:140px;" /></a></div>*/PS：這里再為大家提供2款非常方便的正則表達式工具供大家參考使用：
JavaScript正則表達式在線測試工具：
http://tools.VeVB.COm/regex/javascript
正則表達式在線生成工具：
http://tools.VeVB.COm/regex/create_reg
更多關于C#相關內容感興趣的讀者可查看本站專題：《WinForm控件用法總結》、《C#窗體操作技巧匯總》、《C#數據結構與算法教程》、《C#常見控件用法教程》、《C#面向對象程序設計入門教程》及《C#程序設計之線程使用技巧總結》
希望本文所述對大家C#程序設計有所幫助。
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