can some one tell me how valid letter only by php regex
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/4773825/php-check-only-chars">PHP: Check only chars</a>  </p>
</blockquote>



<p>i want insert only character from A to Z how i can make it by regular expression  </p>
