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奇怪的Apache重写正则表达式

tag-icon • tag-icon apache-2.2 nginx rewrite regex
奇怪的Apache重写正则表达式

我正在将设置从 apache 迁移到 nginx。在此过程中，我在 .htaccess 文件中遇到了此重写规则：

RewriteRule ^/?(?:(?!one|two|three|four).?)+/?$ http://somewhere.else.com [R=301,L]

我通常很擅长正则表达式，但这远远超出了我的理解范围。首先，我甚至不知道允许使用嵌入括号。有人能给我解释一下这个正则表达式吗？如果这是 apache 独有的东西，我如何在 nginx 中复制它？

答案1

  1. (?!one|two|three|four)意思是“非（一或二或三或四）”。

  2. 表示?:非捕获组（因此您不能使用 来引用它$N，例如$1）。

  3. 总之，它几乎意味着任何其中没有“一”、“二”、“三”或“四”序列的文本。

例如：

如果此 URL/categories/category-1/hello-kitten/符合上述规则，则将被重定向。但此 URL/categoneries/category-1/hello-kitten/不会重定向，因为它具有顺序一其中：/categ***one***ries/category-1/hello-kitten/

答案2

以下是一些更具体、更详细的信息，希望对您有帮助：

' ^/?(?:(?!one|two|three|four).?)+/?$ http://somewhere.else.com [R=301,L]
' 
' Options: case insensitive
' 
' Assert position at the beginning of the string «^»
' Match the character “/” literally «/?»
'    Between zero and one times, as many times as possible, giving back as needed (greedy) «?»
' Match the regular expression below «(?:(?!one|two|three|four).?)+»
'    Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
'    Assert that it is impossible to match the regex below starting at this position (negative lookahead) «(?!one|two|three|four)»
'       Match either the regular expression below (attempting the next alternative only if this one fails) «one»
'          Match the characters “one” literally «one»
'       Or match regular expression number 2 below (attempting the next alternative only if this one fails) «two»
'          Match the characters “two” literally «two»
'       Or match regular expression number 3 below (attempting the next alternative only if this one fails) «three»
'          Match the characters “three” literally «three»
'       Or match regular expression number 4 below (the entire group fails if this one fails to match) «four»
'          Match the characters “four” literally «four»
'    Match any single character that is not a line break character «.?»
'       Between zero and one times, as many times as possible, giving back as needed (greedy) «?»
' Match the character “/” literally «/?»
'    Between zero and one times, as many times as possible, giving back as needed (greedy) «?»
' Assert position at the end of the string (or before the line break at the end of the string, if any) «$»
' Match the characters “ http://somewhere” literally « http://somewhere»
' Match any single character that is not a line break character «.»
' Match the characters “else” literally «else»
' Match any single character that is not a line break character «.»
' Match the characters “com ” literally «com »
' Match a single character present in the list “R=301,L” «[R=301,L]»

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