$terms = get_the_term_list( $post->ID, \'post_tag\', \'Tags: \', \', \', \'\');
echo preg_replace(\'/^(.+),([^,]+)$/\', \'$1 &$2\', $terms);
/^（+），（[^，]+）$/（美元）的说明：
/ - delimiter
^ - string beginning
.+ - 1 or more characters
[^,]+ - 1 or more characters that are not a comma
$ - string end
$n是第n个匹配项，即第n对括号
