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Subject: DO NOT REPLY [Bug 53054] New: mod_rewrite Introduction Regex
 Back-Reference Availability: Figure for the back-reference flow through a
 rule
Date: Tue, 10 Apr 2012 18:59:15 +0000
Message-ID: <bug-53054-56585@https.issues.apache.org/bugzilla/>
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https://issues.apache.org/bugzilla/show_bug.cgi?id=53054

             Bug #: 53054
           Summary: mod_rewrite Introduction Regex Back-Reference
                    Availability: Figure for the back-reference flow
                    through a rule
           Product: Apache httpd-2
           Version: 2.5-HEAD
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Documentation
        AssignedTo: docs@httpd.apache.org
        ReportedBy: chealer@gmail.com
    Classification: Unclassified


The Regex Back-Reference Availability of the Apache mod_rewrite Introduction
contains:
One important thing here has to be remembered: Whenever you use parentheses in
Pattern or in one of the CondPattern, back-references are internally created
which can be used with the strings $N and %N (see below). These are available
for creating the strings Substitution and TestString. Figure 1 shows to which
locations the back-references are transferred for expansion as well as
illustrating the flow of the RewriteRule, RewriteCond matching.
http://httpd.apache.org/docs/trunk/en/rewrite/intro.html#regex

Then there's a figure with the caption "The back-reference flow through a
rule." I'm not sure how this happened, but the current figure does not
illustrate the back-reference flow through a rule. The figure is the same
figure as the one used in
http://httpd.apache.org/docs/trunk/en/rewrite/tech.html#InternalRuleset to show
how the whole rewriting process happens. The figure does not mention any
back-reference. The figure used to be /images/mod_rewrite_fig2.gif until
http://svn.apache.org/viewvc?view=revision&revision=895068
https://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/manual/images/mod_rewrite_fig2.png
But I hardly find the previous image more enlightening about back-references.

Nothing below talks about %N or $N.

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