title: Regular expression using Data Annotations in C#
body: <p>I need to validate 3 types using C# MVC 4 Data Annotations:</p>
  
  <pre><code>» public int Quantidade { get; set; }
  
  Values to accept: ex. 10 all the rest need to present a custom message
  
  » public decimal Valor { get; set; } 
  
  Portuguese Currency ex. 10 or 10.20 all the rest need to present a custom message
  
  » public string PesoBruto { get; set; }
  
  Weight ex. 100 or 100.200 all the rest need to present a custom message
  </code></pre>
  
  <p>All of them are Required with a custom message.</p>
  
  <p>Any idea?</p>
  
  <p>Thanks.</p>