重写规则。？仅适用于一个或多个字符？
在网上，我发现了几种定义 RewriteRule 的方法，例如：
RewriteRule .? 404.php [L]
RewriteRule . 404.php [L]
RewriteRule ^ 404.php [L]
但是为什么这些方法在输入垃圾 url 时会起作用？因为第一个 (.?) 意味着应该有零个或一个字符会导致 404.php（而不是一大堆字符或一个单词）。同样， . 和 ^ 分别仅查找字符和行的开头（而不是包含几个字符或单词的行，对吧？）。这就是我根据 RegEx 帮助的想法。我错了吗？或者 ...？
On the net I found several ways of defining a RewriteRule like:
RewriteRule .? 404.php [L]
RewriteRule . 404.php [L]
RewriteRule ^ 404.php [L]
But why would these work when entering a garbage url? Because the first (.?) means that there should be zero or one char which would lead to 404.php (not a whole bunch of chars or a word). Likewise, . and ^ look only for a char and a start of a line (not a line with a few chars or words, right?), respectively. That's what I think based on the RegEx help. Am I wrong? Or ...?
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它们之所以有效，是因为它们可能与“垃圾 URL”匹配。因为
.?匹配零个或一个字符，所以.匹配单个字符，而^仅匹配字符串的开头（无论后面是什么） ）。问题在于如何区分“垃圾”和“非垃圾”URL。
They work because they probably match that “garbage URL”. Because
.?matches zero or one characters,.matches a single character, and^matches just the begin of a string (no matter what follows).The question is rather, how you differentiate between “garbage” and “non-garbage” URLs.
我还没有测试过，但我认为这绝对会将任何请求重定向到 404.php。
正则表达式
.?将在 url 的任何位置搜索 0 或 1 个字符、任何字符。所以基本上，任何 url 都会匹配第一个正则表达式并重定向。行尾的
[L]使 mod-rewrite 在找到匹配项时不再处理任何规则。I haven't tested, but I think this will redirect absolutely any request to 404.php.
The regex
.?will search for 0 or 1 character, any character, at any position of the url. So basically, any url will match the first regex and will redirect.The
[L]at the end of the line makes mod-rewrite to not process any more rules when it founds a match.