Extract the_content in WordPress but only bring back links and <strong> tags

enhanced_excerpt.php

<?php /*
  * Sometimes you will might want something like the_excerpt but still want <strong> tags. Add this function and call it
  * inside your theme template file e.g. sennza_enhanced_excerpt();
  */
function sennza_enhanced_excerpt( $content ) {
    $content = strip_shortcodes( $content );
    $content = str_replace( ']]>', ']]&gt;', $content );
    $content = preg_replace( '/<img[^>]+./','',$content );
    $content = preg_replace( '%<div.+?</div>%is', '', $content );
    $content = preg_replace( '%<object.+?</object>%is', '', $content );
    $content = preg_replace( '/<blockquote>/is', '', $content );
    $content = preg_replace( '%<table.+?</table>%is', '', $content );
    return $content;
}
?>