return !Regex.IsMatch(str, @"[-|;|,|/|(|)|[|]|}|{|%|@|*|!|']");
}

/// <summary>
/// 替換sql語句中的有問題符號
/// </summary>
public static string ChkSQL(string str)
{
string str2;

if (str == null)
{
str2 = "";
}
else
{
str = str.Replace("'", "''");
str2 = str;
}
return str2;
}
#region 過濾攻擊性字符
/// <summary>
/// 過濾攻擊性字符
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string ReplaceBadChar(string str)
{
if (!string.IsNullOrEmpty(str))
{
str = Regex.Replace(str, @"(?s)/*.*?*/", "", RegexOptions.IgnoreCase); //刪除注釋:/* */
str = Regex.Replace(str, @"(?s)<script.*?>.*?</script>", "", RegexOptions.IgnoreCase); //刪除腳本
str = Regex.Replace(str, @"(?s)<style.*?>.*?</style>", "", RegexOptions.IgnoreCase);
//需要把用戶自己添加的樣式都刪除
//<link href="/scripts/PopBox/stylesheets/Styles.css" rel="stylesheet" type="text/css" />
str = Regex.Replace(str, @"(?s)<link[^>]+href+([^>]+?)>", "", RegexOptions.IgnoreCase);

//替換一些比較特殊的字符
// str = str.Replace("&nbsp;", " "); //將&nbsp;替換為一個空格
str = str.Replace("&mdash;", "－");//將&mdash;替換為-
str = str.Replace("&rdquo;", "”");
str = str.Replace("&ldquo;", "“");
str = str.Replace("&le;", "<=");
str = str.Replace("&ne;", "!=");
str = str.Replace("&ge;", ">=");

//<img src="" onerror="" /> <([^>|^<]+?on)([w]+[^=]+?)=([^>]+?)>
str = Regex.Replace(str, @"<([^>|^<]+?on)([a-z|A-Z]+[^=]+?)=([^>]+?)>",
"<$1_$2=$3>", RegexOptions.IgnoreCase);//過濾可能的XSS攻擊,腳本事件

//javascript:
str = str.Replace("javascript:", "ｊａｖａｓｃｒｉｐｔ：");//過濾<img src="javascript:alert(/xss/)" />

str = str.Replace("vbscrript:", "ｖｂｓｃｒｉｐｔ：");//過濾ｖｂｓｃｒｉｐｔ

str = str.Replace("script", "ｓｃｒｉｐｔ");//過濾所有可能的腳本 liehuo.net

//style="XSS:expression(alert(/xss/))"
str = str.Replace("expression", "Ｅxpression");//過濾所有可能的腳本
//str=Regex.Replace(str,@"(style(.*))=(.*)(expression)","$1=$3",
RegexOptions.IgnoreCase); //過濾樣式中，可能帶有的腳本事件
//<iframe src=

str = Regex.Replace(str, "(?s)<iframe.*?>.*?</iframe>", "",
RegexOptions.IgnoreCase);//過濾Ifrmae;網

//防止轉碼XSS攻擊:<img src="&#106&#97&#118&#97&#115&#99&#114&#105&#112&#116&#58&#97
&#108&#101&#114&#116&#40&#39&#88&#83&#83&#39&#41&#59">
str = str.Replace("#", "＃");//過濾#
// str = str.Replace("&", "＆");//過濾&
str = str.Replace("%", "％");//過濾%

//<img STYLE="background-image: 75726c286a61766173
63726970743a616c6572742827585353272929">
str = str.Replace("", "/");//過濾 防止連接１６進制的攻擊

if (str.IndexOf("<script") >= 0)
str = str.Replace("<", "&lt;--script");

if (str.IndexOf("'") > 0)
str = str.Replace("'", "’");

//str = str.Replace("<", "&lt;");
//str = str.Replace(">", "&gt;");

}
return str;
}
#endregion