c#字符过滤方法：
过滤html标签，汉字间空格，制表符，并保留a标签
在公共类如Common中定义方法：
复制代码 代码示例:
public static string ClearHtmlExceptA(string html) {
string acceptable = "a";
string stringPattern = @"</?(?(?=" + acceptable + @")notag|[a-zA-Z0-9]+)(?:s[a-zA-Z0-9-]+=?(?:(["",']?).*?1?)?)*s*/?>";
html = Regex.Replace(html, stringPattern, "");
html = Regex.Replace(html, @"[tn]", "", RegexOptions.IgnoreCase);
html = Regex.Replace(html, @"[r]", "", RegexOptions.IgnoreCase);
//html = Regex.Replace(html, @"[tnrs]","",RegexOptions.IgnoreCase);
return html;
}
