<?php
$str = '<div> ¡¡¡¡ a s¡¡d f</div><p style="background: #f8f8f8;"> 1 2 3</p>';
$str = preg_replace('/(<p.*?>)[( )(\s)(¡¡)]+/is', '$1', $str);
$str = preg_replace('/(<div.*?>)[( )(\s)(¡¡)]+/is', '$1', $str);
echo $str;
?>
