preg_replace causing to repeat

[gilgalbiblewhee]

I think the preg_replace is causing the former result to repeat:

INSERT INTO correction_nbsp (bwas_pages_id, content_before, content_after) VALUES (702, 'chapter: ', ' CHAPTER 1 chapter: ')
INSERT INTO correction_nbsp (bwas_pages_id, content_before, content_after) VALUES (711, 'copies &nbspfrom &nbspauthoritative &nbspsources &nbspshowing &nbspthe ', ' CHAPTER 1 chapter: copies from authoritative sources showing the ')
INSERT INTO correction_nbsp (bwas_pages_id, content_before, content_after) VALUES (714, 'told what the truth is, and still not see it. ', ' CHAPTER 1 chapter: copies from authoritative sources showing the told what the truth is, and still not see it. ')
INSERT INTO correction_nbsp (bwas_pages_id, content_before, content_after) VALUES (716, 'see it? ', ' CHAPTER 1 chapter: copies from authoritative sources showing the told what the truth is, and still not see it. see it? ')

while($row = mysql_fetch_array($result)){
        $old = preg_replace('#&?nbsp;?#i', ' ', $row['content']);
        $new .= preg_replace("/[^ -þ]/", "", $old);
        $sql_record2 = "INSERT INTO correction_nbsp (".$acronym."_pages_id, content_before, content_after)
        VALUES (".$row['id'].", '".$row['content']."', '".$new."')";
        mysql_query($sql_record2,$con) or die(mysql_error());
        echo $sql_record2."<br />\n";
    }