How to replace characters with php regular expression

\\0"; //正则表达式，\0表示全部匹配部分 $replace01 = "\\1"; //正则表达式，\1表示匹配的第一部分 $replace02 = "\\2"; //正则表达式，\2表示匹配的第二部分 echo "原始字符串：$url"."
"; //输出原始字符串 echo "
"; echo "全部匹配部分：".mb_ereg_replace($rule,$replace,$url); echo "
"; echo "
"; echo "匹配的第1部分：".mb_ereg_replace($rule,$replace01,$url); echo "
"; echo "
"; echo "匹配的底2部分：".mb_ereg_replace($rule,$replace02,$url); echo "
"; echo "
";