请教如果通过正则表达式返回一个匹配模式的字符串

Question

preg_match_all("/<title>(.*)<\/title>/isU", $string, $ar);
print_r($ar);

Answer 1

$string = 'aaaaa<title>bbbbbbbb</title>ccccccc';
$newstring = preg_replace("/.*(<title>.*<\/title>).*/is", "\\1", $string);
echo $newstring;

Answer 2

好像楼主不要<title>和</title>，那就改一下
$string = 'aaaaa<title>bbbbbbbb</title>ccccccc';
$newstring = preg_replace("/.*<title>(.*)<\/title>.*/is", "\\1", $string);
echo $newstring;