private void button1_Click(object sender, EventArgs e) { System.Text.RegularExpressions.MatchCollection matches =//使用正则表达式查找重复出现单词的集合 System.Text.RegularExpressions.Regex.Matches(label1.Text, @"\b(?<word>\w+)\s+(\k<word>)\b", System.Text. RegularExpressions.RegexOptions.Compiled | System.Text. RegularExpressions.RegexOptions.IgnoreCase); if (matches.Count != 0)//如果集合中有内容 { foreach (System.Text.RegularExpressions.Match//遍历集合 match in matches) { string word = match.Groups["word"].Value;//获取重复出现的单词 MessageBox.Show(word.ToString(), "英文单词");//弹出消息对话框 } } else { MessageBox.Show("没有重复的单词"); }//弹出消息对话框 } private void Form1_Load(object sender, EventArgs e) { label1.Text =//创建字符串对象 "The the quick brown fox fox jumped over the lazy dog dog."; }
原文:http://www.cnblogs.com/xuekai-to-sharp/p/3552831.html