使用正则匹配比较大的数据时就会发生程序超时并没有异常弹出，而且电脑cpu会到达100%
在.Net4.5中微软有改进的方法，直接调用很方便，但.Net4.5以下就没有，下面写下自己找的处理方法
1、.Net4.5中：
Regex reg = new Regex(正则, RegexOptions.IgnoreCase, TimeSpan.FromSeconds(2));
TimeSpan.FromSeconds就是设置的超时时间，如超过就返回为空，FromSeconds=2是秒，也可以设置分钟小时
2、.Net4.0中：
1 /// <summary>
2 /// 正则解析
3 /// </summary>
4 /// <param name="regex">正则对象</param>
5 /// <param name="input">需要解析的字符串</param>
6 /// <param name="OutTimeMilliseconds">超时时间</param>
7 /// <returns></returns>
8 public static MatchCollection Matchs(Regex regex, string input, int OutTimeMilliseconds)
9 {
10 MatchCollection mc = null;
11 AutoResetEvent are = new AutoResetEvent(false);
12 Thread t = new Thread(delegate()
13 {
14 mc = regex.Matches(input);
15 //注意,在这里一定要把所有的匹配项遍历一次,不然的话当在此方法外遍历的话.也可能会出现等待情况
16 foreach (Match m in mc) { }
17 are.Set();
18 });
19 t.Start();
20 Wait(t, TimeSpan.FromMilliseconds(OutTimeMilliseconds), are, null);
21 return mc;
22 }
23
24 /// <summary>
25 /// 等待方法执行完成,或超时
26 /// </summary>
27 /// <param name="t"></param>
28 /// <param name="OutTime"></param>
29 /// <param name="ares"></param>
30 private static void Wait(Thread t, TimeSpan OutTime, WaitHandle are, WaitHandle cancelEvent)
31 {
32 WaitHandle[] ares;
33 if (cancelEvent == null)
34 ares = new WaitHandle[] { are };
35 else
36 ares = new WaitHandle[] { are, cancelEvent };
37 int index = WaitHandle.WaitAny(ares, OutTime);
38 if ((index != 0) && t.IsAlive)//如果不是执行完成的信号,并且,线程还在执行,那么,结束这个线程
39 {
40 t.Abort();
41 t = null;
42 }
43 }
44
45 /// <summary>
46 /// 正则解析
47 /// </summary>
48 /// <param name="regex">正则对象</param>
49 /// <param name="input">需要解析的字符串</param>
50 /// <param name="OutTimeMilliseconds">超时时间</param>
51 /// <returns></returns>
52 public static Match Match(Regex regex, string input, int OutTimeMilliseconds)
53 {
54 Match m = null;
55 AutoResetEvent are = new AutoResetEvent(false);
56 Thread t = new Thread(delegate() { m = regex.Match(input); are.Set(); });
57 t.Start();
58 Wait(t, TimeSpan.FromMilliseconds(OutTimeMilliseconds), are, null);
59 return m;
60 }
