Regex check Currency value

The following code example illustrates the use of a regular expression to check whether a string has the correct format to represent a currency value. Note the use of enclosing ^ and $ tokens to indicate that the entire string, not just a substring, must match the regular expression.

#using <System.dll>

using namespace System;
using namespace System::Text::RegularExpressions;
int main()
{
   
   // Define a regular expression for currency values.
   Regex^ rx = gcnew Regex( "^-?\\d+(\\.\\d{2})?$" );
   
   // Define some test strings.
   array<String^>^tests = {"-42","19.99","0.001","100 USD"};
   
   // Check each test string against the regular expression.
   System::Collections::IEnumerator^ myEnum = tests->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      String^ test = safe_cast<String^>(myEnum->Current);
      if ( rx->IsMatch( test ) )
      {
         Console::WriteLine( "{0} is a currency value.", test );
      }
      else
      {
         Console::WriteLine( "{0} is not a currency value.", test );
      }
   }
}