gistfile1.aw

<?php

add_action( 'save_post', 'be_div_shortcode_filter', 10, 2 );
function be_div_shortcode_filter( $post_ID, $post ) {

	// Make sure we're on the actual post, not a revision
	if( wp_is_post_revision( $post ) )
		return;
	
	// Filter the content through the dean_is_awesome function that converts 
	// [div class="foo" id="bar"] to <div class="foo" id="bar">
	$content = dean_is_awesome( $post->post_content );

	// If there's no change (no shortcodes), return
	if( $post->post_content === $content )
		return;
	
	// Update be_div_shortcode custom field
	update_post_meta( $post_ID, 'be_div_shortcode', $content );

}