IIS URL Rewrite {R:N} clarification

by

As per the documentation:

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.

So taking the example that follows in the documentation:

^(www\.)(.*)$

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

To make it simple:

  • {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

Note:

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

More Related Contents:

  1. Proper method to remove www from address using IIS URL Rewrite
  2. IIS7 Permissions Overview – ApplicationPoolIdentity
  3. Remove HTML or ASPX Extension
  4. Enabling net.tcp in IIS7
  5. How do I set the default page of my application in IIS7?
  6. HTTP Error 500.19 with 0x8007000d on IIS7 “Malformed XML” in web.config
  7. How do I set up my IIS to keep my application alive?
  8. IIS7 Accessing Network Share
  9. How to set Date and time format in IIS 7
  10. IIS7 URL Rewrite – Add “www” prefix
  11. URL rewriting : css, js, and images not loading
  12. Avoid web.config inheritance in child web application using inheritInChildApplications
  13. How do you debug classic ASP?
  14. IIS7 Overrides customErrors when setting Response.StatusCode?
  15. Difference between and ?
  16. X-Frame-Options Allow-From multiple domains
  17. Is Enabling Double Escaping Dangerous?
  18. How to write a url rewrite in nginx?
  19. HTTP Error 500.19 – Internal Server Error
  20. Can PHP and ASP.Net run together within the same web site in IIS 7.5?
  21. What do I need to change to allow my IIS7 ASP.Net 3.5 application to create an event source and log events to Windows EventLog?
  22. Is there a url rewriting engine for Tomcat/Java?
  23. How do I route images using ASP.Net MVC routing?
  24. Can I use commas in a URL?
  25. Line endings messed up in Git – how to track changes from another branch after a huge line ending fix?
  26. Routing URLs in PHP
  27. internet explorer font face ssl
  28. Routes in Codeigniter – Automatically
  29. Apache rewrite rules not being applied for angularjs
  30. IIS7 URL Redirection from root to sub directory [closed]

Leave a Comment