/**
	 * Expand the acronyms for SEO
	 * @param string $txt
	 */
	protected function _seoAcronymExpansion( $txt )
	{
		if ( $txt == '' )
		{
			return $txt;
		}

		$acronyms = $this->cache->getCache('ipseo_acronyms');

		if( !is_array($acronyms) OR !count($acronyms) )
		{
			return $txt;
		}

		$temp_text = $txt;
		$urls      = array();
		$tags      = array();
		$txt       = str_replace( '<#EMO_DIR#>', '-#-#-#EMO_DIR#-#-#-', $txt );

		/* Grab images */
		preg_match_all( '#<img([^>]+?)>#i', $txt, $matches );

		foreach( $matches[0] as $m )
		{
			$c = count( $urls );
			$urls[ $c ] = $m;

			$txt = str_replace( $m, '<!--url{' . $c . '}-->', $txt );
		}

		/* Grab <a> */
		preg_match_all( '#<a([^>]+?)>#i', $txt, $matches );

		foreach( $matches[0] as $m )
		{
			$c = count( $urls );
			$urls[ $c ] = $m;

			$txt = str_replace( $m, '<!--url{' . $c . '}-->', $txt );
		}

		/* Grab all other tags */
		preg_match_all( '#<(?:[/a-z]{1,})([^>]+?)>#i', $txt, $matches );

		foreach( $matches[0] as $m )
		{
			$c = count( $tags );
			$tags[ $c ] = $m;

			$txt = str_replace( $m, '<!--tag{' . $c . '}-->', $txt );
		}

		/* Grab non linked URLs */
		preg_match_all( '#((http|https|news|ftp)://(?:[^<>\)\[\"\s]+|[a-zA-Z0-9/\._\-!&\#;,%\+\?:=]+))#is', $txt, $matches );

		foreach( $matches[0] as $m )
		{
			$c = count( $urls );
			$urls[ $c ] = $m;

			$txt = str_replace( $m, '<!--url{' . $c . '}-->', $txt );
		}

		//-----------------------------------------
		// Convert back entities
		//-----------------------------------------

		for( $i = 65; $i <= 90; $i++ )
		{
			$txt = str_replace( "&#" . $i . ";", chr($i), $txt );
		}

		for( $i = 97; $i <= 122; $i++ )
		{
			$txt = str_replace( "&#" . $i . ";", chr($i), $txt );
		}

		//-----------------------------------------
		// Go all loopy
		//-----------------------------------------

		if ( is_array($acronyms) && count($acronyms) )
		{
			foreach( $acronyms as $r )
			{
				$this->_currentAcronym = $r;

				/*																								vv Ticket #835804 */
				$wordModifier	= ( IPS_DOC_CHAR_SET == 'UTF-8' && IPSText::isUTF8( $txt ) ) ? '[^<>\p{L}]|\b' : '[^<>a-zA-Z0-9-_&;]';
				$caseModifier	= empty($r['a_casesensitive']) ? 'i' : '';
				$r['a_short']	= preg_quote( $r['a_short'], "/" );

				$txt			= preg_replace_callback( '/(^|\b|\W)(' . $r['a_short'] . ')(\b|\W|$)/' . $caseModifier, array( $this, '_replaceAcronym' ), $txt );
			}
		}

		/* replace urls */
		if ( count( $urls ) )
		{
			foreach( $urls as $k => $v )
			{
				$txt = str_replace( "<!--url{" . $k . "}-->", $v, $txt );
			}
		}

		/* replace tags */
		if ( count( $tags ) )
		{
			foreach( $tags as $k => $v )
			{
				$txt = str_replace( "<!--tag{" . $k . "}-->", $v, $txt );
			}
		}

		$txt = str_replace( '-#-#-#EMO_DIR#-#-#-', '<#EMO_DIR#>', $txt );

		return $txt ? $txt : $temp_text;
	}