php换数字的正则 不指定

Else , 2010/07/13 09:12 , 程员外的那些事儿 , Comments(0) , Reads(614) , Via Original
$str= "3,4,5";
echo preg_replace("[(\d+)|(,)]", "-", $str);


虽然是少了点,但也是到学到内容!

ps
標題錯了!
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