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C#裡所用的Regex，如果要提取字串裡的子匹配項（我都不知道那個叫啥名字，別名。）是很方便的，比如：
Regex rx = new Regex(@"<title>(?<title>[\s\S]+)?</title>", RegexOptions.Compiled | RegexOptions.IgnoreCase);Match m = rx.Match(content);if (m.Success){ string title = m.Result("${title}");}
但如果是javascript呢，咋整。兩邊文法好像稍有點不一樣。我弄了下，只有一些支離破碎的經驗值，先記錄下來：
str = "<html><head><title>呵呵呵</title></head><body></body></html>";reg = /<title>([\s\S]+)<\/title>/givar result;if ((result = reg.exec(str)) != null) { alert(result);//顯示“<title>呵呵呵</title>”，“呵呵呵” alert(result[1]);//顯示“呵呵呵” //}
參考文章：
http://www.html-js.com/article/3420
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