Rewrite
The preceding section described
the Alias
module and its allies. Everything
these directives can do, and more, can be done instead by
mod_rewrite.c, an extremely compendious module
that is almost a complete software product in its own right. But for
simple tasks Alias
and friends are much easier to
use.
The documentation is thorough, and the reader is referred to http://www.engelschall.com/pw/apache/rewriteguide/ for any serious work. You should also look at http://www.apache.org/docs/mod/mod_rewrite.html. This section is intended for orientation only.
Rewrite
takes a
rewriting pattern and applies it to
the URL. If it matches, a rewriting substitution
is applied to the URL. The patterns are regular expressions
familiar to us all in their simplest form — for
example, mod.*\.c
, which
matches any module filename. The complete science of regular
expressions is somewhat extensive, and the reader is referred
to ... /src/regex/regex.7, a manpage that can be
read with nroff
-man
regex.7
(on FreeBSD, at least). Regular
expressions are also described in the POSIX specification and in
Jeffrey Friedl’s Mastering Regular
Expressions (O’Reilly, 2002).
It might well be worth using Perl to practice with regular expressions before using them in earnest. To make complicated expressions work, it is almost essential to build them up from simple ones, testing each change as you go. Even the most expert find that convoluted regular expressions often do not work the first time.
The essence ...
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