ASP.NET使用正则表达式屏蔽垃圾信息

using System; 
using System.Text.RegularExpressions; 
public class Test 
{ 
public static void Main () 
{ 
// Define a regular expression for currency values. 
Regex rx = new Regex(@"^-?\d+(\.\d{2})?$"); 
// Define some test strings. 
string[] tests = {"-42", "19.99", "0.001", "100 USD", 
".34", "0.34", "1,052.21"}; 
// Check each test string against the regular expression. 
foreach (string test in tests) 
{ 
if (rx.IsMatch(test)) 
{ 
Console.WriteLine("{0} is a currency value.", test); 
} 
else 
{ 
Console.WriteLine("{0} is not a currency value.", test); 
} 
} 
} 
}