正则表达式匹配字符串的一部分

Question

I am trying to match parts of an string into variables after getting the page from curl

the string is

value="http://ca.isohunt.com/upload.php?mode=bt&id=880001&sid=3096d80a1c9d2962f8f35a837a3f23e0"

I am trying to get &id='' and $sid=''

i tried using this regex expression using preg_match and it did not work

/([^_]*?)&sid-.*?\$

Answer 1

You shouldn't use regular expressions for this.

If your input string includes value=" (and the " at the end) just extract the URL. You could probably do this easiest using substr :

$url = substr($input, 7, -1);

If the string is more variable, and all you know is that the URL is the stuff inside the quotes, use:

preg_match('/".*"/', $input, $match);
$url = $match[0];

If your $input has only the URL, you can of course skip this step completely. Then:

$query = parse_url($url, PHP_URL_QUERY);
$params = array();
parse_str($query, $params);

echo $params['mode'];  // bt
echo $params['id']; // 880001
echo $params['sid']; // 3096d80a1c9d2962f8f35a837a3f23e0

Answer 2

Use parse_url

$url = 'http://username:password@hostname/path?arg=value#anchor';
$data = parse_url($url);
print_r(parse_url($url));

The above example will output:

Array
(
    [scheme] => http
    [host] => hostname
    [user] => username
    [pass] => password
    [path] => /path
    [query] => arg=value
    [fragment] => anchor
)

Then:

 $queryFields = split('[&]', $data['query']);

Answer 3

First off, you shouldn't escape the $ unless you're expecting it in the "value" string.

Your regex could be /&?sid=([^&]+)/ and /&?id=([^&]+)/ , provided that you don't want to do any checking on the url itself. Or combined: /&?id=([^&]+).*&?sid=([^&]+)/ .

Remember that the values will be exported to $matches[1] and $matches[2] when you're calling something like preg_match('/&?id=([^&]+).*&?sid=([^&]+)/', $value, $matches);

Answer 4

  if ($c=preg_match_all ("/.*?(id=)(\d+).*?(sid=)([a-zA-Z0-9_]{1,})/is", $txt, $matches))
  {
      $id=$matches[2][0];
      $sid=$matches[4][0];
      print "id = $id <br> sid = $sid\n";
  }

Here is the code that you can use to get the 2 values. This gets you the values of the 2 parameters.