title: How to make a regex match case insensitive?
body: <p>I have following regular expression for <a href="http://en.wikipedia.org/wiki/Postal_codes_in_Canada" rel="noreferrer">postal code of Canada</a>. </p>
  
  <pre><code>^[ABCEGHJKLMNPRSTVXY]{1}\d{1}[A-Z]{1} *\d{1}[A-Z]{1}\d{1}$
  </code></pre>
  
  <p>It is working fine but accepts only Capital letters. I want it work for both capital and small letters.</p>