IIS URL重写{R:N}的说明 [英] IIS URL Rewrite {R:N} clarification

问题描述

我无法理解{R:N}的目的.任何人都可以弄清楚何时使用
{R:0}与{R:1}

I've not been able to understand the purpose of {R:N}. Could anyone please clarify when to use
{R:0} vs. {R:1}

用法示例:

<action type="Redirect" url="http://www.{HTTP_HOST}/{R:0}" />

我看过使用{R:1}的ScottGu

I've seen ScottGu using {R:1}

以下是{R:0}

看看下面的IIS链接，但不能完全理解下面的定义:

Had a look at the IIS link below but could not quite digest the definition below:

条件模式的后向引用由{C:N}标识，其中N为0到9； N为0到9.规则模式的反向引用由{R:N}标识，其中N为0到9.请注意，对于两种类型的反向引用，{R:0}和{C:0}都将包含匹配的字符串

Back-references to condition patterns are identified by {C:N} where N is from 0 to 9; back-references to rule pattern are identified by {R:N} where N is from 0 to 9. Note that for both types of back-references, {R:0} and {C:0}, will contain the matched string

推荐答案

根据文档:

使用ECMAScript模式语法时，可以使用向后引用 通过在模式的一部分周围加上括号来创建 必须捕获反向引用.

When an ECMAScript pattern syntax is used, a back-reference can be created by putting parenthesis around the part of the pattern that must capture the back-reference.

以文档中的以下示例为例:

So taking the example that follows in the documentation:

^(www\.)(.*)$

在条件中使用输入字符串www.foo.com，您将具有:

And using the input string www.foo.com in the conditions, you will have:

{C:0} - www.foo.com
{C:1} - www.
{C:2} - foo.com

简单起见:

• {R:x}用作规则模式(<match url="...">)的后向引用.
• {C:x}用作条件模式(<conditions><add input="{HTTP_HOST}" pattern="..."></conditions>)的后向引用
• 0参考包含整个输入字符串
• 1引用将包含与第一个括号()中的模式匹配的字符串的第一部分，2引用第二个括号，以此类推，直到引用编号9

• {R:x} is used as back reference from the rule pattern (<match url="...">).
• {C:x} is used as back reference from the condition pattern (<conditions><add input="{HTTP_HOST}" pattern="..."></conditions>)
• The 0 reference contains the whole input string
• The 1 reference will contain the first part of the string matching the pattern in the first parenthesis (), the 2 reference the second one, etc...up to the reference number 9

注意:

使用通配符"模式语法时，始终使用反向引用 在模式中使用星号(*)时创建.不 向后引用是在?"时创建的用于模式.

When "Wildcard" pattern syntax is used, the back-references are always created when an asterisk symbol (*) is used in the pattern. No back-references are created when "?" is used in the pattern.

http://www.iis .net/learn/extensions/url-rewrite-module/url-rewrite-module-configuration-reference#Using_back-references_in_rewrite_rules

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