(PHP)正则表达式-贪婪匹配与懒惰匹配的区别

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<?php
/**
 * Created by PhpStorm.
 * User: Ollydebug
 * Date: 2015/11/15
 * Time: 15:20
 */

$pattern = '/google.+123/';
//$pattern = '/google.+123/';   修正匹配
//$pattern = '/google.+123/U';  懒惰匹配
$subject = 'I love google__123123123123123123';

$matches = array();
preg_match($pattern,$subject,$matches);

show($matches);

function show($var){
    if(empty($var)){
        echo 'null';
    }elseif(is_array($var)||is_object($var)){
        // array,object
        echo '<pre>';
        print_r($var);
        echo '</pre>';
    }else{
        //string,int,float
        echo $var;
    }
}


?>