如何获得找到的值，而不是替换？ 使用preg_replace php

Question

how to get the value found, instead of replacing?

echo $response=$htmlParserA->find("/tbody/tr/td",5)->plaintext."<br>";
$str=preg_replace("/[0-9][0-9][0-9]/","",$response);
echo $str;

Response:
Before HTTP/1.1 301 Moved Permanently
After HTTP/1.1 Moved Permanently

how to get 301?

ANSWER:

$str=preg_match("/[0-9][0-9][0-9]/",$response,$asd); 
echo $asd[0];

Answer 1

preg_match will do what you want:

$input = "HTTP/1.1 301 Moved Permanently";
$matches = array();
$found = preg_match("/\d{3}/", $input, $matches);
if($found)
{
    echo "Code = " . $matches[0];
}

If desired, you could make the pattern more strict:

$found = preg_match("/HTTP\/1\.1\s(\d{3})/", $input, $matches);
if($found)
{
    echo "Code = " . $matches[1];
}