preg_match or similar to get value from a string

I am not good with preg_match or similar functions which are not deprecated.

Here are 2 strings:

1. /Cluster-Computers-c-10.html

2. /Mega-Clusters-c-15_32.html

I would to find out:

In number 1 example, how to get the value betwee开发者_Go百科n -c- and .html (the value in the example is 10). The value is always an integer (numeric)

In number 2 example, how to get the value between -c- and .html (the value in the example is 15_32) . The value is always an integer seperated by _

Basically what I want to do is check if a string has either c-10.html or c-15_32.html and get the value and pass it to the database.

You can do:

preg_match('/-c-(\d+(?:_\d+)?)\.html$/i',$str);

Explanation:

-c-     : A literal -c-
(       : Beginning of capturing group
 \d+    : one or more digits, that is a number
 (?:    : Beginning of a non-capturing group
   _\d+ : _ followed by a number
 )      : End of non-capturing group
 ?      : Makes the last group optional
)       : End of capturing group
\.      : . is a metacharacter to match any char (expect newline) to match 
          a literal . you need to escape it.
html    : a literal html
$       : End anchor. Without it the above pattern will match any part 
          of the input string not just the end.

See it

preg_match('~-c-(.*?)\.html$~', $str, $matches)
var_dump($matches);

/-c-(\d+(?:_\d+)?)\.html$/i

-c- look for -c-
(\d+(?:_\d+)?) match number or number-underscore-number
\.html a period and trailing html
$ force it to match the end of the line
i case-insensitive match

Example:

<?php
  header('Content-Type: text/plain');
  $t = Array(
    '1) /Cluster-Computers-c-10.html',
    '2) /Mega-Clusters-c-15_32.html'
  );
  foreach ($t as $test){
    $_ = null;
    if (preg_match('/-c-(\d+(?:_\d+)?)\.html$/i',$test,$_))
      var_dump($_);
    echo "\r\n";
  }
?>

output:

array(2) {
  [0]=>
  string(10) "-c-10.html"
  [1]=>
  string(2) "10"
}

array(2) {
  [0]=>
  string(13) "-c-15_32.html"
  [1]=>
  string(5) "15_32"
}

Working Code: http://www.ideone.com/B70AQ

The simplest way I see would be:

preg_match( '/-c-([^.]+)\.html/i', $url, $matches );
var_dump( $matches );