求一个正则表达式

Question

.body{
align: center;
font-size: 10pt;
background: #CCCDDC;
background-image: url(http://localhost/images/test1.png);
background-repeat: repeat-x;
}
.body{
align: center;
font-size: 10pt;
background: #CCCDDC;
background-image: url(http://localhost/images/test2.png);
background-repeat: repeat-x;
}
.body{
align: center;
font-size: 10pt;
background: #CCCDDC;
background-image: url(http://localhost/images/test3.png);
background-repeat: repeat-x;
}我想获取到这个值
{
align: center;
font-size: 10pt;
background: #CCCDDC;
background-image: url(http://localhost/images/test2.png);
background-repeat: repeat-x;
}大概匹配规则就是：{ + 一堆字符串 + test2.png + 一堆字符串 + }怎么匹配，有些急

Answer 1

是这个意思么？<?php
$str = <<<STR
.body{
    align: center;
    font-size: 10pt;
    background: #CCCDDC;
    background-image: url(http://localhost/images/test1.png);
    background-repeat: repeat-x;
}
.body{
    align: center;
    font-size: 10pt;
    background: #CCCDDC;
    background-image: url(http://localhost/images/test2.png);
    background-repeat: repeat-x;
}
.body{
    align: center;
    font-size: 10pt;
    background: #CCCDDC;
    background-image: url(http://localhost/images/test3.png);
    background-repeat: repeat-x;
}
STR;
$patten = '/({[^{]+test2.png[^{]*})/i';
preg_match_all($patten,$str,$arr);
echo "<pre>";
print_r($arr[1]);

Answer 2

$str = <<<STR
.body{
    align: center;
    font-size: 10pt;
    background: #CCCDDC;
    background-image: url(http://localhost/images/test1.png);
    background-repeat: repeat-x;
}
.body{
    align: center;
    font-size: 10pt;
    background: #CCCDDC;
    background-image: url(http://localhost/images/test2.png);
    background-repeat: repeat-x;
}
.body{
    align: center;
    font-size: 10pt;
    background: #CCCDDC;
    background-image: url(http://localhost/images/test3.png);
    background-repeat: repeat-x;
}
STR;
preg_match_all('/\{.*test2\.png.*\}/isU', $str, $matches);
print_r($matches[0]);
/**
输出结果：Array ( [0] => { align: center; font-size: 10pt; background: #CCCDDC; background-image: url(http://localhost/images/test1.png); background-repeat: repeat-x; } .body{ align: center; font-size: 10pt; background: #CCCDDC; background-image: url(http://localhost/images/test2.png); background-repeat: repeat-x; } )
*/