Question

http://www.example.com?id=05

or

http://www.example.com?id=05&name=johnny

This is a string. And I want to get the value of $id from it.

What is the correct pattern for it?

Answer 1

@PhpMyCoder’s solution is perfect. But if you absolutely need to use preg_match (though completely unnecessary in this case)

$subject = "http://www.mysite.com?id=05&name=johnny";
$pattern = '/id=[0-9A-Za-z]*/'; //$pattern = '/id=[0-9]*/'; if it is only numeric.
preg_match($pattern, $subject, $matches);
print_r($matches);