正则表达式替换{}请教

Question

http://www.hao123.com/down.php?pid=4014&Id={a:0}&aaa={b:222}请教这种正则怎么替换？
{a:0}替换成1，{b:222}替换成2

Answer 1

 $url="http://www.hao123.com/down.php?pid=4014&Id={kk:0}&aaa={b:222}";
$arr=array(
'kk'=>1,
'b' =>2,
'c' => 3,
);
foreach ($arr as $k => $value) {
if(strstr("$url","$k:")){
$url=preg_replace("/\\{".$k.":\\d+\\}/",$value,$url);
}
}
echo $url;