本文实例讲述了WinForm使用正则表达式提取内容的方法。分享给大家供大家参考，具体如下：
用VS新建WinForm程序，窗体上是三个文本框和一个按钮。
可以自己构造正则表达式，自己修改匹配内容
正则表达是要提取的部分为hewenqitext
代码如下：
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开发人员命令提示查看PublicKeyToken(公钥标记)" " 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=" "消灭僵尸游戏" " 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=" "纯CSS3漂亮的房子不错的天气" " 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元旦倒计时特效" " 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=" "直接说喜欢你！" " 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重写模块工具" " 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=" "山水画" " 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=" "刘德华" " 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为网站设置域名" " 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=" "谢霆锋手机背景图" " 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=" "现代舞舞蹈家玛莎·葛兰姆动画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，都希望男票这样解决战斗。。。" " 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=" "现代舞舞蹈家玛莎·葛兰姆动画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); // 取得匹配项列表 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开发人员命令提示查看PublicKeyToken(公钥标记)" 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="消灭僵尸游戏" 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="纯CSS3漂亮的房子不错的天气" 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元旦倒计时特效" 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="直接说喜欢你！" 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重写模块工具" 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="山水画" 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="刘德华" 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为网站设置域名" 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="谢霆锋手机背景图" 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="现代舞舞蹈家玛莎·葛兰姆动画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，都希望男票这样解决战斗。。。" 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="现代舞舞蹈家玛莎·葛兰姆动画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> */
dy("nrwz");
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