标签：topic ext 匹配 com pre 定义 https title new
这里都是以 图片中的元素为例：
1 Regex reg = new Regex(@"(?is)(?<=<img[^>]*)[^""]*(?=""[^>]*>)");
替换alt 内容：
var replace = "alt=‘ 要替换的内容 "; source = Regex.Replace(source, "alt=\"\"", replace);
上面那个并不严谨
var replace = " 替换内容 "; source = Regex.Replace(source, @"(?is)(?<=<img[^>]*)[^""]*(?=""[^>]*>)", replace);
自己先定义规则，然后替换
1 Regex r = new Regex(@"(?is)(?<=<img[^>]*)"); 2 3 var replace = " 替换内容 "; 4 5 source = r.Replace(source, new MatchEvaluator(x => replace));
参考： http://bbs.csdn.net/topics/390320097
https://q.cnblogs.com/q/60920/
标签：topic ext 匹配 com pre 定义 https title new
原文地址：http://www.cnblogs.com/moy-1313133/p/6920699.html
