正则如何替换格式?

Question

比如我有一张/uploads/201014/A307DDB63C9AC4BFC5FA03B452A31D7C_1270519676501.jpg我想把它路径换成/uploads/201014/A307DDB63C9AC4BFC5FA03B452A31D7C_1270519676501_m.jpg 但是也有可能他的后缀名是/uploads/201014/A307DDB63C9AC4BFC5FA03B452A31D7C_1270519676501.gif或.png的相应要替换成/uploads/201014/A307DDB63C9AC4BFC5FA03B452A31D7C_1270519676501m_.gif 请问正则如何操作?

Answer 1

<?php 
$str = "/uploads/201014/A307DDB63C9AC4BFC5FA03B452A31D7C_1270519676501.jpg";
echo preg_replace("#(/uploads/201014/.*)(\..*)#","\${1}_m\${2}",$str);///uploads/201014/A307DDB63C9AC4BFC5FA03B452A31D7C_1270519676501_m.jpg
?>

Answer 2

借用楼上的，稍微改了下，目录不写死
preg_replace("#(/[^/]+/[^/]+/.+)(\..+)#", "\${1}_m\${2}",$str);

Answer 3

preg_replace('/([^\.]+)\.([^ ]+)/',"\${1}_m\${2}",$str);
LZ 后面的没说清楚吧,.gif或.png 要换成什么样的呢;

Answer 4

谢谢楼上几位大哥 
就是说有一图片这种图片有格式有可能是gif或jpg或png或bmp的 加入是a.jpg我就需要把他换成a_m.jpg a.gif我就需要把他换成a_m.gif 就是这样但是格式是不确定的 不知明白否?

Answer 5

$str = '/uploads/201014/A307DDB63C9AC4BFC5FA03B452A31D7C_1270519676501.jpg';
echo preg_replace("@([^\.]+)\.(.+)@i","$1_m.$2",$str);
//output
/uploads/201014/A307DDB63C9AC4BFC5FA03B452A31D7C_1270519676501_m.jpg