这个正则表达式/重写有什么作用？
在下面的代码中，正则表达式的作用是什么？
RewriteCond %{REQUEST_URI} ^/(?:[A-Za-z]+(?:/[A-Za-z]*)*)(?:/\d+)?$
RewriteRule .* var/www/%1/index.php [L]
重写规则的结果是什么？
谢谢，我正在帮助一个朋友修复一个旧的 CMS，我不知道为什么制造它的人会这样做。
In the following code, what does the regex do?
RewriteCond %{REQUEST_URI} ^/(?:[A-Za-z]+(?:/[A-Za-z]*)*)(?:/\d+)?$
RewriteRule .* var/www/%1/index.php [L]
What is the outcome of the re-wrtie rule?
Thanks, I am helping a friend fix an old CMS and I don't know why whomever made it did this.
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AFAIK 它会在你不期望的时候生成 404。为什么？
(?: Something) 括号与 () 基本相同，只是它们不设置匹配变量。由于所有括号都是这样的
%1永远不会被定义。获取 Alexander 的描述
/letters{/letters}([/digits])，其中/digits是可选的。重复组是“零个或多个字母”，因此会吃掉任何/字符，这些是贪婪匹配，因此/aa/bb/cc/123将被解析为 (/aa)(/bb)(/cc)(/）（123）。这将会失败，因为 123 与(?:/\d+)?不匹配
(?:/\d+)?因此它只会匹配 alpha 路径字符串，例如 /aaa/bbb/ccc 和%1 将是“”，在这些情况下，这将重定向到相对于当前路径的
var/www//index.php，这可能是 DOCROOT，所以除非DOCROOT/var/www/index.php存在，这将导致 404。AFAIK it will generate 404s when you don't expect it to. Why?
The (?: something) brackets are basically the same as () except that they don't set a match variable. Since all bracketing is like this
%1will never be defined.Picking up Alexander's description
/letters{/letters}([/digits])where the/digitsare optional. The repeat group is "zero or more letters" and hence will eat any/characters, and these are greedy matches, so/aa/bb/cc/123will be parsed as (/aa)(/bb)(/cc)(/)(123). This will fail since 123 does not match(?:/\d+)?So it will only match alpha path strings, e.g. /aaa/bbb/ccc and %1 will be "" and in these circumstances this will redirect to
var/www//index.phprelative to the current path, which will probably be the DOCROOT, so unlessDOCROOT/var/www/index.phpexists, this will result in a 404.它应该将
/letters{/letters}[/digits]形式的所有请求重定向到本地文件var/www/SOMETHING/index.php但它确实如此不是：首先，没有捕获组（所有组都有前导?:，因此，不清楚SOMETHING是什么）。接下来，var/www...部分可能应该有一个前导/。It is supposed to redirect all requests of the form
/letters{/letters}[/digits]to a local filevar/www/SOMETHING/index.phpbut it does not: first, there is no capturing group (all groups have leading?:and, consequently, it is not clear whatSOMETHINGwill be). Next, thevar/www...part should perhaps have a leading/.按照 mod-rewrite 帮助，
%1 应该引用最后一个 RewriteCond 中正则表达式的第一个捕获组。 但是正则表达式只有非捕获组...Following the mod-rewrite help, the
%1should refer to the first capturing group of the regexp from the last RewriteCond. But the regexp only has non-capturing groups...