title: Regular Expression for Decimal or Blank
body: <p>Sorry for the potentially dumb question but I am trying to pull together a regular expression that will allow:</p>
  
  <p>A number with 1 or 2 numbers before a decimal point, and 0-6 numbers after the decimal point.  However I also need to allow the field to be blank if so required.</p>
  
  <p>Valid Examples</p>
  
  <pre><code>0.952321
  1.20394
  12.12
  25
  Blank
  </code></pre>
  
  <p>Invalid Examples</p>
  
  <pre><code>123.45678
  1.1234567
  </code></pre>
  
  <p>Please can anyone help?</p>