title: Regular expression to check if string contains only zeros
body: <p>I need to validate an Amount field, which should not be Zero amount. For eg. it <strong>CANNOT</strong> be <strong>0000,0.00,000.000,0</strong> 
  BUT it <strong>CAN</strong> be <strong>0.0001, 1.000,1.00,1234.00</strong> etc values.</p>
  
  <p>Tried <code>@"[^1-9]+"</code> and <code>@"0+((\.0+)"</code> But they invalidate every value which contains a zero.</p>