The Definitive Guide to Apache mod_rewrite by Rich Bowen

By Rich Bowen

Organizing web pages is extremely dynamic and infrequently chaotic. hence, it will be important that host internet servers control URLs so one can take care of briefly or completely relocated assets, hinder assaults through automatic worms, and keep watch over source entry.
The Apache mod_rewrite module has lengthy encouraged suits of pleasure since it bargains an extraordinary toolset for manipulating URLs. The Definitive consultant to Apache mod_rewrite publications you thru configuration and use of the module for quite a few reasons, together with easy and conditional rewrites, entry keep watch over, digital host upkeep, and proxies.
This publication was once authored through wealthy Bowen, famous Apache professional and Apache software program starting place member, and attracts on his years of expertise administering, and standard talking and writing approximately, the Apache server.

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Let’s go though the rule one metacharacter at a time: The \(? metacharacter represents an optional opening parenthesis. The backslash is necessary because parentheses have special meaning, as discussed previously. We want to remove that special meaning and have a literal opening parenthesis. The question mark makes this character optional. That is, the person entering the data may or may not enclose the first three numbers within parentheses, and we want to ensure that either method is acceptable.

Summary Having a good grasp of regular expressions is a necessary prerequisite to working with mod_rewrite. All too often, people try to build regular expressions by the brute-force method, trying various different combinations at random until something seems to mostly work. This results in expressions that are inefficient and fragile, as well as being a great waste of time and the cause of much frustration. Keep a bookmark in this chapter, and refer back to it when you’re trying to figure out what a particular regex is doing.

Table 4-1. qxd 1/10/06 1:13 AM Page 33 CHAPTER 4 ■ THE REWRITE RULE DIRECTIVE While the first two examples should be relatively straightforward, the third example does warrant some special mention. php is called the path information. php file (or perhaps to a CGI program) in the environment variable PATH_INFO. 0 and later, you will need to set the AcceptPathInfo configuration directive to On. Per-Dir Context Within a per-dir context, this behavior changes. htaccess file or within a block.

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