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[code]ISAPI_rewrite中文手冊
原文檔：http://www.isapirewrite.com/docs/
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配置：
在NT 2000 XP和2003平臺上，在系統帳戶下應該INETINFO程序應該與IIS5以共存模式過濾器運行。所以系統帳戶應該給予對所有的ISAPI-REWIRITE DLLS 和所有的HTTPD。INI文件至少可讀權限，我們也推薦對給予系統帳戶對于所有包括HTTPD。INI文件的文件夾的可寫權限，這將允許產生HTTP。PARSE。ERRORS文件，這些文件包含配置文件語法錯誤。對于PROXY模塊也需要額外的權限，因為它將運行于連接池或HIGH-ISPLATED應用模式，IIS帳戶共享池和HIGH-ISOLATION池應被給予 對RWHELPERE。DLL的可讀權限。缺省情況下IWAM-《計算機名》被用于所有的池，在相應的COM+應用設置中應借助COM+ADMINISTRATION MMC SNAP-IN建立池帳戶
配置文件格式化：
有兩種形式的配置文件-GLOBAL（SERVER-LEVEL）和INDIVIDUAL（SITE-LEVAL）文件，GLOBAL配置文件應被命名為HTTPD.INI并出現在ISAPI-REWRITE安裝目錄中，文件的快捷方式通過開始菜單提供，INDIVIDUAL配置文件應名為HTTPD。INI并且能夠出現在虛擬站點的物理根目錄中，兩種類型的格式化是相同的并是標準的WINDOWS。INI文件，所有的指令都應該放在這一部分并且所有指令都應該以分隔線放置，任何這一部分以外的文本都將被忽略
HTTPD.INI文件示例
[ISAPI_Rewrite]
# This is a comment
# 300 = 5 minutes
CacheClockRate 300
RepeatLimit 20
# Block external access to the httpd.ini and httpd.parse.errors files
RewriteRule /httpd(?:\.ini|\.parse\.errors) / [F,I,O]
# Block external access to the Helper ISAPI Extension
RewriteRule .*\.isrwhlp / [F,I,O]
# Some custom rules
RewriteCond Host: (.+)
RewriteCond 指令
Syntax:（句法） RewriteCond TestVerb CondPattern [Flags]
這一指令定義一個條件規則，在 RewriteRule 或者 RewriteHeader或 RewriteProxy指令前預行RewriteCond指令，后面的規則 只有它的，模式匹配URI的當前狀態并且額外的條件也被應用才會被應用。
TestVerb
Specifies verb that will be matched against regular e-xpression.
特別定義的動詞匹配規定的表達式
TestVerb=(URL | METHOD | VERSION | HTTPHeaderName: | %ServerVariable) where:
URL - returns Request-URI of client request as described in RFC 2068 (HTTP 1.1);
返回客戶端在RFC2068中描述的需求的Request-URI
METHOD - returns HTTP method of client request (OPTIONS, GET, HEAD, POST, PUT, Delete or TRACE);
返回客戶端需求(OPTIONS, GET, HEAD, POST, PUT, Delete or TRACE)的HTTP方法
VERSION - returns HTTP version;
返回HTTP版本
HTTPHeaderName - returns value of the specified HTTP header. HTTPHeaderName can be any valid HTTP header name. Header names should include the trailing colon ":". If specified header does not exists in a client's request TestVerb is treated as empty string.
返回特定義的HTTP頭文件的值
HTTPHeaderName =
Accept:
Accept-Charset:
Accept-Encoding:
Accept-Language:
Authorization:
Cookie:
From:
Host:
If-Modified-Since:
If-Match:
If-None-Match:
If-Range:
If-Unmodified-Since:
Max-Forwards:
Proxy-Authorization:
Range:
Referer:
User-Agent:
Any-Custom-Header
得到更多的關于HTTP頭文件的和他們的值的信息參考RFC2068

ServerVariable 返回特定義的服務器變量的值 。例如服務器端口，全部服務器變量列表應在IIS文檔中建立，變量名應用%符預定；
CondPattern
The regular e-xpression to match TestVerb
規則表達式匹配TestVerb
[Flags]
Flags is a comma-separated list of the following flags:

O (nOrmalize)
Normalizes string before processing. Normalization includes removing of an URL-encoding, illegal characters, etc. This flag is useful with URLs and URL-encoded headers
RewriteRule 指令
Syntax: RewriteRule Pattern FormatString [Flags]
這個指令可以不止發生一次，每個指令定義一個單獨的重寫規則，這些規則的定義命令很重要，因為這個命令在應用運行時規則是有用途的I (ignore case）
不管大小寫強行指定字符匹配，這個FLAG影響RewriteRule指令和相應的RewriteCond 指令
F (Forbidden)
對客戶端做反應，停止REWRITING進程并且發送403錯誤，注意在這種情況下FORMATSTRING 是無用的并可以設置為任何非空字符串。
L (last rule)
不應用任何重寫規則在此停止重寫進程，使用這個FLAG以阻止當前被重寫的URI被后面的規則再次重寫
N (Next iteration)
強制REWRITINGENGINE調整規則目標并且從頭重啟規則檢查（所有修改將保存），重啟次數由RepeatLimit指定的值限制，如果這個數值超過N FLAG將被忽略
NS (Next iteration of the same rule)
以N標記工作不從相同的規則重啟規則規則進程（例如強制重復規則應用），通過RepeatLimit指令指定一個反復實行某一規則的最大數目，
P (force proxy)
強制目的URI在內部強制為代理需求并且立即通過ISAPI擴展應付代理需求，必須確認代理字符串是一個有效的URI包括協議 主機等等否則代理將返回錯誤
R (explicit redirect）
強制服務器對客戶端發出重定向指示即時應答，提供目的URI的新地址，重定向規則經常是最后規則
RP (permanent redirect)
幾乎和[R]標記相同但是發布301HTTP狀態而不是302HTTP狀態代碼
U (Unmangle Log)
當URI是源需求而不是重寫需求時記載URI
O (nOrmalize)
在實行之前標準化字符串。標準化包括URL-ENCODING，不合法的字符的再移動等，這個標記對于URLS和URLS-ENDODED頭是有用的
CL (Case Lower)
小寫
CU (Case Upper)
大寫
RewriteHeader directive
Syntax: RewriteHeader HeaderName Pattern FormatString [Flags]
這個指令是RewriteRule的更概括化變種，它不僅重寫URL的客戶端需求部分，而且重寫HTTP頭，這個指令不僅用于重寫。生成，刪除任何HTTP頭，甚至改變客戶端請求的方法
HeaderName
指定將被重寫的客戶頭，可取的值與 RewriteCond 指令中TestVerb參數相同
Pattern
限定規則表達式以匹配Request-URI，
FormatString
限定將生成新的URI的FormatString
[Flags]
是一個下列FLAGS的命令分隔列表
I (ignore case）
不管大小寫強行指定字符匹配，這個FLAG影響RewriteRule指令和相應的RewriteCond 指令
F (Forbidden)
對客戶端做反應，停止REWRITING進程并且發送403錯誤，注意在這種情況下FORMATSTRING 是無用的并可以設置為任何非空字符串。
L (last rule)
不應用任何重寫規則在此停止重寫進程，使用這個FLAG以阻止當前被重寫的URI被后面的規則再次重寫
N (Next iteration)
強制REWRITINGENGINE調整規則目標并且從頭重啟規則檢查（所有修改將保存），重啟次數由RepeatLimit指定的值限制，如果這個數值超過N FLAG將被忽略
NS (Next iteration of the same rule)
以N標記工作不從相同的規則重啟規則規則進程（例如強制重復規則應用），通過RepeatLimit指令指定一個反復實行某一規則的最大數目，
R (explicit redirect）
強制服務器對客戶端發出重定向指示即時應答，提供目的URI的新地址，重定向規則經常是最后規則
RP (permanent redirect)
幾乎和[R]標記相同但是發布301HTTP狀態而不是302HTTP狀態代碼
U (Unmangle Log)
當URI是源需求而不是重寫需求時記載URI
O (nOrmalize)
在實行之前標準化字符串。標準化包括URL-ENCODING，不合法的字符的再移動等，這個標記對于URLS和URLS-ENDODED頭是有用的
CL (Case Lower)
小寫
CU (Case Upper)
大寫
要重移動頭，FORMAT STRING模式應該生成一個空字符串，例如這一規則將從客戶請求中重移代理信息
RewriteHeader User-Agent: .* $0
并且這一規則將把OLD-URL HEADER 加入請求中。
RewriteCond URL (.*)RewriteHeader Old-URL: ^$ $1
最后一個例子將通過改變請求方法定向所有的WEBDAV請求到/WEBDAV。ASP
RewriteCond METHOD OPTIONS
RewriteRule (.*) /webdav.asp?$1
RewriteHeader METHOD OPTIONS GET
RewriteProxy directive
Syntax: RewriteProxy Pattern FormatString [Flags]
強制目的URI在內部強制為代理需求并且立即通過ISAPI擴展應付代理需求，這將允許IIS作為代理服務器并且重路由到其他站點和服務器
Pattern
限定規則表達式以匹配Request-URI，
FormatString
限定將生成新的URI的FormatString
[Flags]
是一個下列FLAGS的命令分隔列表
D (Delegate security)
代理模式將試圖以當前假冒的用戶資格登陸遠程服務器，
C (use Credentials)
代理模式將試圖一在URL或基本授權頭文件中指定的資格登陸遠程服務器，用這個標記你可以使用http://user:password@host.com/path/ syntax 作為URL
F (Follow redirects)
缺省情況下ISAPI_Rewrite 將試圖將MAP遠程服務器返回的重定向指令到本地服務器命名空間，如果遠程服務器返回重定向點到那臺服務器其他的某個位置，ISAPI_Rewrite 將修改這一重定向指令指向本服務器名，這將避免用戶看到真實（內部）服務器名稱
使用F標記強制代理模式內部跟蹤遠程服務器返回的重定向指令，使用這個標記如果你根本不需要接受遠程服務器的重定向指令，在WINHTTP設置中有重定向限制以避免遠程重定向循環
I (ignore case)
不管大小寫強行指定字符匹配
U (Unmangle Log)
當URI是源需求而不是重寫需求時記載URI
O (nOrmalize)
在實行之前標準化字符串。標準化包括URL-ENCODING，不合法的字符的再移動等，這個標記對于URLS和URLS-ENDODED頭是有用的
CacheClockRate directive
Syntax: CacheClockRate Interval
這個指令只在GLOBAL配置內容中出現，如果這個指令在SITE-LEVEL內容中出現將被忽略并把錯誤信息寫入httpd.parse.errors 文件
ISAPI_Rewrite caches每次在第一次加載時配置，使用這個指令你可以限定當一個特定站點從緩存中清理的不活動周期，把這個參數設置的足夠大你可以強制ISAPI_Rewrite 永不清理緩存，記住任何配置文件的改變將在下次請求后立即更新而忽略這個周期
Interval
限定特定配置被清理出緩存的不作為時間（以秒計），缺省值3600（1小時）
EnableConfig and DisableConfig directives
Syntax:
EnableConfig [SiteID|"Site name"]
DisableConfig [SiteID|"Site name"]
對所選站點激活或不激活SITE-LEVEL配置或者改變缺省配置，缺省SITE-LEVEL配置不激活，這個指令只出現在GLOBAL配置內容中
SiteID
Numeric metabase identifier of a site
Site name
Name of the site as it appears in the IIS console
不用參數使用這個命令將改變缺省配置到ENABLE/DISABLE配置進程
例子
下面例子將使配置僅作用于ID=1（典型是缺省站點）名字是MY SITE的站點
DisableConfig
EnableConfig 1
EnableConfig"My site"
下邊例子將激活名稱為SOMESITE配置因為它分割設置重載了缺省設置
EnableConfig"Some site"
DisableConfig
EnableRewrite and DisableRewrite directives
Syntax:
EnableRewrite [SiteID|"Site name"]
DisableRewrite [SiteID|"Site name"]
對所選站點激活或不激活重寫或者改變缺省配置，缺省重寫配置激活，這個指令只出現在GLOBAL配置內容中
SiteID
Numeric metabase identifier of a site
Site name
Name of the site as it appears in the IIS console.
不使用參數這個命令將全部激活或者不激活
RepeatLimit directive
Syntax: RepeatLimit Limit
這個指令可以出現在GLOBAL和SITE-LEVEL配置文件中，如果出現在GLOBAL配置文件中竟改變GLOBAL對于所有站點的限制，出現在SITE-LEVEL配置中竟只改變對于這個站點的限制并且這個限制不能超過GLOBAL限制
ISAPI_Rewrite在實行規則時允許循環，這個指令允許限制最大可能循環的數量，可以設置為0或1而不支持循環，
LIMIT
限制最大循環數量，缺省32
RFStyle directive
Syntax: RFStyle Old | New
Configuration Utility
ISAPI_Rewrite Full包括配置功用（可以在 ISAPI_Rewrite 程序組中啟動），它允許你瀏覽測試狀態并輸入注冊碼（如果在安裝過程中沒有注冊），并且調整部分與代理模式操作相關的產品功能，UTILITY是由三個頁面組成的屬性表
Trial page允許你瀏覽TIRAL狀態并輸入注冊碼（如果在安裝過程中沒有注冊）
Settings page
這頁包含對下列參數的編輯框
Helper URL
這個參數影響過濾器和代理模塊之間的聯系方式，它即可以是以點做前綴的文件擴展名（如 .isrwhlp）也可以是絕對路徑，
第一種情況下擴展名將追加在初始請求URI上并且代理模塊竟通過SCRIPT MAP激活，缺省擴展名isrwhlp在安裝進程中加在global script map 中，如果你改變這個擴展名或者你的應用不繼承global script map 設置你應該手動添加向script map 所需求的入口。這個應該有如下參數
Executable: An absolute path to the rwhelper.dll in the short form
Extension: Desired extension (.isrwhlp is default)
Verbs radio button: All Verbs
Script engine checkbox: Checked
Check that file exists checkbox: Unchecked
我們已經創建了一個WSH script proxycfg.vbs ，可以簡單在一個a script maps中注冊，她位于安裝文件夾并且可以在命令行一如下方式運行
cscript proxycfg.vbs [-r] [MetabasePath]
Optional -r 強制注冊擴展名
Optional MetabasePath parameter allows specification of the first metabase key to process. By default it is "/localhost/W3SVC".
要在所有現存的 script maps 中注冊你可以以如下命令行激活 script
cscript proxycfg.vbs -r
第二種情況下你應該提供一個URI作為'Helper URL'的值，你也應該map 一個 ISAPI_Rewrite的安裝文件夾作為美意個站點的虛擬文件家
注意：根據顧客反應，IIS5（也許包括IIS4）對長目錄名有問題。所以我們強烈推薦使用短目錄名
Worker threads limit
這個參數限制在代理擴展線程池中工作線程數，缺省為0意味著這個限制等于處理器數量乘以2
Active threads limit
這個參數限制當前運行線程數，這個數量不可大于"Worker threads limit". 缺省0意思是等于處理器數量
Queue size 這個參數定義最大請求數量，如果你曾經看到Queue timeout expired" 信息在 the Application event log中你可以增加這個參數
Queue timeout
這個參數定義你在內部請求隊列中防止新請求的最大等待時間，如果你曾經看到Queue timeout expired" 信息在 the Application event log中你可以增加這個參數
Connect timeout
以毫秒設定代理模塊連接超時
Send timeout
以毫秒設定代理模塊發送超時
Receive timeout
以毫秒設定代理模塊發送超時
About page.
It contains copyright information and a link to the ISAPI_Rewrite's web site.

Regular e-xpression syntax
這一部分覆蓋了 ISAPI_Rewrite規定的表達句法
Literals
所有字符都是原意除了 ".", "*", "?", "+", "(", ")", "{", "}", "[", "]", "^" and "$".，這些字符在用“\”處理時是原意，原意指一個字符匹配自身
Wildcard
The dot character "." matches any single character except null character and newline character
以下為句法
Repeats
A repeat is an e-xpression that is repeated an arbitrary number of times. An e-xpression followed by "*" can be repeated any number of times including zero. An e-xpression followed by "+" can be repeated any number of times, but at least once. An e-xpression followed by "?" may be repeated zero or one times only. When it is necessary to specify the minimum and maximum number of repeats explicitly, the bounds operator "{}" may be used, thus "a{2}" is the letter "a" repeated exactly twice, "a{2,4}" represents the letter "a" repeated between 2 and 4 times, and "a{2,}" represents the letter "a" repeated at least twice with no upper limit. Note that there must be no white-space inside the {}, and there is no upper limit on the values of the lower and upper bounds. All repeat e-xpressions refer to the shortest possible previous sub-e-xpression: a single character; a character set, or a sub-e-xpression grouped with "()" for example.
Examples:
"ba*" will match all of "b", "ba", "baaa" etc.
"ba+" will match "ba" or "baaaa" for example but not "b".
"ba?" will match "b" or "ba".
"ba{2,4}" will match "baa", "baaa" and "baaaa".
Non-greedy repeats
Non-greedy repeats are possible by appending a '?' after the repeat; a non-greedy repeat is one which will match the shortest possible string.
For example to match html tag pairs one could use something like:
"<\s*tagname[^>]*>(.*?)<\s*/tagname\s*>"
In this case $1 will contain the text between the tag pairs, and will be the shortest possible matching string.
Parenthesis
Parentheses serve two purposes, to group items together into a sub-e-xpression, and to mark what generated the match. For example the e-xpression "(ab)*" would match all of the string "ababab". All sub matches marked by parenthesis can be back referenced using \N or $N syntax. It is permissible for sub-e-xpressions to match null strings. Sub-e-xpressions are indexed from left to right starting from 1, sub-e-xpression 0 is the whole e-xpression.
Non-Marking Parenthesis
Sometimes you need to group sub-e-xpressions with parenthesis, but don't want the parenthesis to spit out another marked sub-e-xpression, in this case a non-marking parenthesis (?:e-xpression) can be used. For example the following e-xpression creates no sub-e-xpressions:
"(?:abc)*"
Alternatives
Alternatives occur when the e-xpression can match either one sub-e-xpression or another, each alternative is separated by a "|". Each alternative is the largest possible previous sub-e-xpression; this is the opposite behaviour from repetition operators.
Examples:
"a(b|c)" could match "ab" or "ac".
"abc|def" could match "abc" or "def".
Sets
A set is a set of characters that can match any single character that is a member of the set. Sets are delimited by "[" and "]" and can contain literals, character ranges, character classes, collating elements and equivalence classes. Set declarations that start with "^" contain the compliment of the elements that follow.
Examples:
Character literals:
"[abc]" will match either of "a", "b", or "c".
"[^abc] will match any character other than "a", "b", or "c".
Character ranges:
"[a-z]" will match any character in the range "a" to "z".
"[^A-Z]" will match any character other than those in the range "A" to "Z".
Character classes
Character classes are denoted using the syntax "[:classname:]" within a set declaration, for example "[[:space:]]" is the set of all whitespace characters. The available character classes are:
alnum Any alpha numeric character.
alpha Any alphabetical character a-z and A-Z. Other characters may also be included depending upon the locale.
blank Any blank character, either a space or a tab.
cntrl Any control character.
digit Any digit 0-9.
graph Any graphical character.
lower Any lower case character a-z. Other characters may also be included depending upon the locale.
print Any printable character.
punct Any punctuation character.
space Any whitespace character.
upper Any upper case character A-Z. Other characters may also be included depending upon the locale.
xdigit Any hexadecimal digit character, 0-9, a-f and A-F.
word Any word character - all alphanumeric characters plus the underscore.
unicode Any character whose code is greater than 255, this applies to the wide character traits classes only.
There are some shortcuts that can be used in place of the character classes:
\w in place of [:word:]
\s in place of [:space:]
\d in place of [:digit:]
\l in place of [:lower:]
\u in place of [:upper:]
Collating elements
Collating elements take the general form [.tagname.] inside a set declaration, where tagname is either a single character, or a name of a collating element, for example [[.a.]] is equivalent to [a], and [[.comma.]] is equivalent to [,]. ISAPI_Rewrite supports all the standard POSIX collating element names, and in addition the following digraphs: "ae", "ch", "ll", "ss", "nj", "dz", "lj", each in lower, upper and title case variations. Multi-character collating elements can result in the set matching more than one character, for example [[.ae.]] would match two characters, but note that [^[.ae.]] would only match one character.
Equivalence classes
Equivalenceclassestakethegeneralform[=tagname=] inside a set declaration, where tagname is either a single character, or a name of a collating element, and matches any character that is a member of the same primary equivalence class as the collating element [.tagname.]. An equivalence class is a set of characters that collate the same, a primary equivalence class is a set of characters whose primary sort key are all the same (for example strings are typically collated by character, then by accent, and then by case; the primary sort key then relates to the character, the secondary to the accentation, and the tertiary to the case). If there is no equivalence class corresponding to tagname, then [=tagname=] is exactly the same as [.tagname.].
To include a literal "-" in a set declaration then: make it the first character after the opening "[" or "[^", the endpoint of a range, a collating element, or precede it with an escape character as in "[\-]". To include a literal "[" or "]" or "^" in a set then make them the endpoint of a range, a collating element, or precede with an escape character.
Line anchors
An anchor is something that matches the null string at the start or end of a line: "^" matches the null string at the start of a line, "$" matches the null string at the end of a line.
Back references
A back reference is a reference to a previous sub-e-xpression that has already been matched, the reference is to what the sub-e-xpression matched, not to the e-xpression itself. A back reference consists of the escape character "\" followed by a digit "1" to "9", "\1" refers to the first sub-e-xpression, "\2" to the second etc. For example the e-xpression "(.*)\1" matches any string that is repeated about its mid-point for example "abcabc" or "xyzxyz". A back reference to a sub-e-xpression that did not participate in any match, matches the null string. In ISAPI_Rewrite all back references are global for entire RewriteRule and corresponding RewriteCond directives. Sub matches are numbered up to down and left to right beginning from the first RewriteCond directive of the corresponding RewriteRule directive, if there is one.
Forward Lookahead Asserts
There are two forms of these; one for positive forward lookahead asserts, and one for negative lookahead asserts:
"(?=abc)" matches zero characters only if they are followed by the e-xpression "abc".
"(?!abc)" matches zero characters only if they are not followed by the e-xpression "abc".
Word operators
The following operators are provided for compatibility with the GNU regular e-xpression library.
"\w" matches any single character that is a member of the "word" character class, this is identical to the e-xpression "[[:word:]]".
"\W" matches any single character that is not a member of the "word" character class, this is identical to the e-xpression "[^[:word:]]".
"\<" matches the null string at the start of a word. "\>" matches the null string at the end of the word.
"\b" matches the null string at either the start or the end of a word.
"\B" matches a null string within a word.
Escape operator
The escape character "\" has several meanings.
The escape operator may introduce an operator for example: back references, or a word operator.
The escape operator may make the following character normal, for example "\*" represents a literal "*" rather than the repeat operator.
Single character escape sequences:
The following escape sequences are aliases for single characters:

Escape sequence Character code Meaning
\a 0x07 Bell character.
\t 0x09 Tab character.
\v 0x0B Vertical tab.
\e 0x1B ASCII Escape character.
\0dd 0dd An octal character code, where dd is one or more octal digits.
\xXX 0xXX A hexadecimal character code, where XX is one or more hexadecimal digits.
\x{XX} 0xXX A hexadecimal character code, where XX is one or more hexadecimal digits, optionally a unicode character.
\cZ z-@ An ASCII escape sequence control-Z, where Z is any ASCII character greater than or equal to the character code for '@'.
Miscellaneous escape sequences:
The following are provided mostly for perl compatibility, but note that there are some differences in the meanings of \l \L \u and \U:
Escape sequence Meaning
\w Equivalent to [[:word:]].
\W Equivalent to [^[:word:]].
\s Equivalent to [[:space:]].
\S Equivalent to [^[:space:]].
\d Equivalent to [[:digit:]].
\D Equivalent to [^[:digit:]].
\l Equivalent to [[:lower:]].
\L Equivalent to [^[:lower:]].
\u Equivalent to [[:upper:]].
\U Equivalent to [^[:upper:]].
\C Any single character, equivalent to '.'.
\X Match any Unicode combining character sequence, for example "a\x 0301" (a letter a with an acute).
\Q The begin quote operator, everything that follows is treated as a literal character until a \E end quote operator is found.
\E The end quote operator, terminates a sequence begun with \Q.
What gets matched?
The regular e-xpression will match the first possible matching string, if more than one string starting at a given location can match then it matches the longest possible string. In cases where their are multiple possible matches all starting at the same location, and all of the same length, then the match chosen is the one with the longest first sub-e-xpression, if that is the same for two or more matches, then the second sub-e-xpression will be examined and so on. Note that ISAPI_Rewrite uses MATCH algorithm. The result is matched only if the e-xpression matches the whole input sequence. For example:
RewriteCond URL ^/somedir/.* #will match any request to somedir directory and subdirectories, while
RewriteCond URL ^/somedir/ #will match only request to the root of the somedir.
Special note about "pathological" regular e-xpressions
ISAPI_Rewrite uses a very powerful regular e-xpressions engine Regex++ written by Dr. John Maddock. But as any real thing it's not ideal: There exists some "pathological" e-xpressions which may require exponential time for matching; these all involve nested repetition operators, for example attempting to match the e-xpression "(a*a)*b" against N letter a's requires time proportional to 2N. These e-xpressions can (almost) always be rewritten in such a way as to avoid the problem, for example "(a*a)*b" could be rewritten as "a*b" which requires only time linearly proportional to N to solve. In the general case, non-nested repeat e-xpressions require time proportional to N2, however if the clauses are mutually exclusive then they can be matched in linear time - this is the case with "a*b", for each character the matcher will either match an "a" or a "b" or fail, where as with "a*a" the matcher can't tell which branch to take (the first "a" or the second) and so has to try both.
Boost 1.29.0 Regex++ could detect "pathological" regular e-xpressions and terminate theirs matching. When a rule fails ISAPI_Rewrite sends "500 Internal Server error - Rule Failed" status to a client to indicate configuration error. Also the failed rule is disabled to prevent performance losses
Format string syntax
In format strings, all characters are treated as literals except: "(", ")", "$", "\", "?", ":".
To use any of these as literals you must prefix them with the escape character \
The following special sequences are recognized:
Grouping:
Use the parenthesis characters ( and ) to group sub-e-xpressions within the format string, use \( and \) to represent literal '(' and ')'.
Sub-e-xpression expansions:
The following perl like e-xpressions expand to a particular matched sub-e-xpression:
$` Expands to all the text from the end of the previous match to the start of the current match, if there was no previous match in the current operation, then everything from the start of the input string to the start of the match.
$' Expands to all the text from the end of the match to the end of the input string.
$& Expands to all of the current match.
$0 Expands to all of the current match.
$N Expands to the text that matched sub-e-xpression N.
Conditional e-xpressions:
Conditional e-xpressions allow two different format strings to be selected dependent upon whether a sub-e-xpression participated in the match or not:
?Ntrue_e-xpression:false_e-xpression
Executes true_e-xpression if sub-e-xpression N participated in the match, otherwise executes false_e-xpression.
Example: suppose we search for "(while)|(for)" then the format string "?1WHILE:FOR" would output what matched, but in upper case.
Escape sequences:
The following escape sequences are also allowed:

\a The bell character.
\f The form feed character.
\n The newline character.
\r The carriage return character.
\t The tab character.
\v A vertical tab character.
\x A hexadecimal character - for example \x0D.
\x{} A possible unicode hexadecimal character - for example \x{1A0}
\cx The ASCII escape character x, for example \c@ is equivalent to escape-@.
\e The ASCII escape character.
\dd An octal character constant, for example \10
Examples例子
Emulating host-header-based virtual sites on a single site
例如你在兩個域名注冊www.site1.com 和 www.site2.com，現在你可以創建兩個不同的站點而使用單一的物理站點。把以下規則加入到你的httpd.ini 文件
[ISAPI_Rewrite]
#Fix missing slash char on folders
RewriteCond Host: (.*)
RewriteRule ([^.?]+[^.?/]) http\://$1$2/ [I,R]
#Emulate site1
RewriteCond Host: (?:www\.)?site1\.com
RewriteRule (.*) /site1$1 [I,L]
#Emulate site2
RewriteCond Host: (?:www\.)?site2\.com
RewriteRule (.*) /site2$1 [I,L]

現在你可以把你的站點放在/site1 和 /site2 目錄中.
或者你可以應用更多的類規則：
[ISAPI_Rewrite]
#Fix missing slash char on folders
RewriteCond Host: (.*)
RewriteRule ([^.?]+[^.?/]) http\://$1$2/ [I,R]
RewriteCond Host: (www\.)?(.+)
RewriteRule (.*) /$2$3
為站點應該命名目錄為 /somesite1.com, /somesite2.info, etc.
Using loops (Next flag) to convert request parameters
假如你希望有物理URL如 http://www.myhost.com/foo.asp?a=A&b=B&c=C 使用請求如 http://www.myhost.com/foo.asp/a/A/b/B/c/C 參數數量可以從兩個請求之間變化
至少有兩個解決辦法。你可以簡單的為每一可能的參數數量添加一個分隔規則或者你可以使用一個技術說明如下面的例子
ISAPI_Rewrite]
RewriteRule (.*?\.asp)(\?[^/]*)?/([^/]*)/([^/]*)(.*) $1(?2$2&:\?)$3=$4$5 [NS,I]
這個規則將從請求的URL中抽取一個參數追加在請求字符的末尾并且從頭重啟規則進程。所以它將循環直到所有參數被移動到適當的位置，或者直到超過RepeatLimit
也存在許多這個規則的變種。但使用不同的分隔字符，例如。使用URLS如http://www.myhost.com/foo.asp~a~A~b~B~c~C 可以應中下面的規則：
ISAPI_Rewrite]
RewriteRule (.*?\.asp)(\?[^~]*)?~([^~]*)~([^~]*)(.*) $1(?2$2&:\?)$3=$4$5 [NS,I]
Running servers behind IIS
假如我們有一個內網服務器運行IIS而幾個公司服務器運行其他平臺，這些服務器不能從INTERNET直接進入，而只能從我們公司的網絡進入，有一個簡單的例子可以使用代理標記映射其他服務器到IIS命名空間：
[ISAPI_Rewrite]
RewriteProxy /mappoint(.+) http\://sitedomain$1 [I,U]
Moving sites from UNIX to IIS
這個規則可以幫助你把URL從 /~username 改變到 /username 和從 /file.html 改變到 /file.htm. 這個在你僅僅把你的站從UNIX移動到IIS并且保持搜索引擎和其他外部頁面對老頁面的連接時是有用的
[ISAPI_Rewrite]
#redirecting to update old links
RewriteRule (.*)\.html $1.htm
RewriteRule /~(.*) http\://myserver/$1 [R]
Moving site location
許多網管問這樣的問題：他們要重定向所有的請求到一個新的網絡服務器，當你需要建立一個更新的站點取代老的的時候經常出現這樣的問題，解決方案是用ISAPI_Rewrite 于老服務器中
[ISAPI_Rewrite]
#redirecting to update old links
RewriteRule (.+) http\://newwebserver$1 [R]
Browser-dependent content
Dynamically generated robots.txt
robots.txt是一個搜索引擎用來發現能不能被索引的文件，但是為一個大站創建一個有許多動態內容的這個文件是很復雜的工作，我們可以寫一個robots.asp script
現在使用單一規則生成 robots.txt
[ISAPI_Rewrite]
RewriteRule /robots\.txt /robots.asp
Making search engines to index dynamic pages
站點的內容存儲在XML文件中，在服務器上有一個/XMLProcess.asp 文件處理XML文件并返回HTML到最終用戶，URLS到文檔有如下形式
http://www.mysite.com/XMLProcess.asp?xml=/somdir/somedoc.xml
但是許多公共引擎不能索引此類文檔，因為URLS包含問號（文檔動態生成），
ISAPI_Rewrite可以完全消除這個問題
[ISAPI_Rewrite]
RewriteRule /doc(.*)\.htm /XMLProcess.asp\?xml=$1.xml
現在使用如同http://www.mysite.com/doc/somedir/somedoc.htm的URL進入文檔，搜索引擎將不知道不是somedoc.htm 文件并且內容是動態生成的
Negative e-xpressions (NOT
有時當模式不匹配你需要應用規則，這種情況下你可以使用在規則表達式中稱為Forward Lookahead Asserts
例如你需要不使用IE把所有用戶移動到別的地點
[ISAPI_Rewrite]
# Redirect all non Internet Explorer users
# to another location
RewriteCond User-Agent: (?!.*MSIE).*
RewriteRule (.*) /nonie$1
Dynamic authentification
例如我們在站點上有一些成員域，我們在這個域上需要密碼保護文件而我們不喜歡用BUILT-IN服務器安全，這個情況下可以建立一個ASP腳本（稱為proxy.asp），這個腳本將代理所有請求到成員域并且檢查請求允許，這里有一個簡單的模板你可以放進你自己的授權代碼

現在我們要通過配置 ISAPI_Rewrite 通過這個頁面代理請求:
[ISAPI_Rewrite]
# Proxy all requests through proxy.asp
RewriteRule /members(.+) /proxy.asp\?http\://mysite.com/members$1
Blocking inline-images (stop hot linking
假設我們在http://www.mysite.com/下有些頁面有一些內聯 GIF圖片很好，他人可以不直接協商通過盜鏈到他們的頁面上，我們不喜歡這樣因為加大了服務器流量
當我們不能100%保護圖片，我們至少可以在瀏覽器發送一個HTTP Referer header的地方限制這種情況
[ISAPI_Rewrite]
RewriteCond Host: (.+)
RewriteCond Referer: (?!http://\1.*).*
RewriteRule .*\.(?:gif|jpg|png) /block.gif [I,O]

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