关于脏字典过滤问题－用正则表达式来过滤脏数据(整理)

1//脏字典数据存放文件路径
 2        private static string FILE_NAME="zang.txt";
 3        //脏数据字典表，如：脏数据一|脏数据二|脏数据三
 4        public static string dirtyStr="";
 5        
 6        public ValidDirty()
 7        {
 8            if (HttpRuntime.Cache["Regex"]==null)
 9            {
10                dirtyStr=ReadDic();
11                //用于检测脏字典的正则表达式
12                Regex validateReg= new Regex("^((?!"+dirtyStr+").(?<!"+dirtyStr+"))*$",RegexOptions.Compiled|RegexOptions.ExplicitCapture);    
13                HttpRuntime.Cache.Insert("Regex" ,validateReg,null,DateTime.Now.AddMinutes(20) ,TimeSpan.Zero);
14            }
15            
16        }
17        private string ReadDic()
18        {
19            FILE_NAME=Environment.CurrentDirectory+"\\"+FILE_NAME;
20
21            if (!File.Exists(FILE_NAME)) 
22            {
23                Console.WriteLine("{0} does not exist.", FILE_NAME);
24                return "";
25            }
26            StreamReader sr = File.OpenText(FILE_NAME);
27            String input="";
28            while (sr.Peek() > -1) 
29            {
30                input += sr.ReadLine() ;
31            }
32            
33            sr.Close();
34            return input;
35
36        }
37
38        
39        public bool ValidByReg(string str)
40        {
41            Regex reg=(Regex)HttpRuntime.Cache["Regex"];
42            return reg.IsMatch(str) ;
43            
44        }