$subject='测 试 字 符';
$pattern='/测\s*试\s*字\s*符/U';
preg_match_all($pattern, $subject,$a);
print_r($a);
$pattern='/测\s*试\s*字\s*符/U';
preg_match_all($pattern, $subject,$a);
print_r($a);
调试欢乐多
$subject='测 试 字 符';
//$pattern='测\s*试\s*字\s*符';
$pattern = "/(.+)[\s]*/ei";
preg_match_all($pattern,$subject,$out);
print_r($out[0]);
?>