- preg_replace: documentation ( source)
<?php
$body = '<body link="#0066FF" vlink="#6633CC" bgcolor="#33D7FF" style=\'margin:0\'>'."\n\n";
$body .= '<object type="application/x-shockwave-flash" data="http://flash-mp3-player.net/medias/player_mp3.swf" width="200" height="20">'."\n";
$body .= ' <param name="movie" value="http://flash-mp3-player.net/medias/player_mp3.swf" />'."\n";
$body .= ' <param name="bgcolor" value="#ffffff" />'."\n";
$body .= ' <param name="FlashVars" value="mp3=%MP3%&loop=1&autoplay=1" />'."\n";
$body .= '</object>'."\n";
$html = '<html><body link="#0066FF" vlink="#6633CC" bgcolor="#4CDCFF" style=\'margin:0\'>asddasdas</body></html>';
echo preg_replace('#<body[^>]+>#', " aaa $0 aaa ", $html);