c#通过正则表达式去掉html的一些方法，记录一下

Posted 2021-08-31 avi9111

public string RemovehtmlTags(string htmlStream)
        {
            if (htmlStream == null)
            {
                throw new Exception("Your input html stream is null!");
                return null;
            }
            /*
             * 最好把所有的特殊HTML标记都找出来，然后把与其相对应的Unicode字符一起影射到Hash表内，最后一起都替换掉
             */
            //先单独测试,成功后,再把所有模式合并
            //注:这两个必须单独处理
            //去掉嵌套了HTML标记的javascript:(<script)[\\\\s\\\\S]*(</script>)
            //去掉css标记:(<style)[\\\\s\\\\S]*(</style>)
            //去掉css标记:\\\\..*\\\\{[\\\\s\\\\S]*\\\\}
            htmlStream = Regex.Replace(htmlStream, "(<script)[\\\\s\\\\S]*?(</script>)|(<style)[\\\\s\\\\S]*?(</style>)", " ", RegexOptions.IgnoreCase);
            //htmlStream = RemoveTag(htmlStream, "script");
            //htmlStream = RemoveTag(htmlStream, "style");
            //去掉普通HTML标记:<[^>]+>
            //替换空格: |&|­| |­
            htmlStream = Regex.Replace(htmlStream, "<[^>]+>| |&|­| |­|•|<|>", " ", RegexOptions.IgnoreCase);
            //htmlStream = RemoveTag(htmlStream);
            //替换左尖括号
            //htmlStream = Regex.Replace(htmlStream, "<", "<");
            //替换右尖括号
            //htmlStream = Regex.Replace(htmlStream, ">", ">");
            //替换空行
            //htmlStream = Regex.Replace(htmlStream, "[\\n|\\r|\\t]", " ");//[\\n|\\r][\\t*| *]*[\\n|\\r]
            htmlStream = Regex.Replace(htmlStream, "(\\r\\n[\\r|\\n|\\t| ]*\\r\\n)|(\\n[\\r|\\n|\\t| ]*\\n)", "\\r\\n");
            htmlStream = Regex.Replace(htmlStream, "[\\t| ]{1,}", " ");
            return htmlStream.Trim();
        }