mod_rewrite is built on top of the Perl Compatible Regular Expression (PCRE) vocabulary, and a grasp of regular expressions is essential if you’re going to get anything out of this book. It’s not required that you be a regular expression (commonly referred to as regex) wizard, but you do need to know the vocabulary. And it’s a good idea to have a handy reference to the syntax.
This chapter provides that, but it is certainly possible to find more thorough treatments of this topic. Regular expression syntax is a big topic, and it is thoroughly covered elsewhere. In particular, I highly recommend Mastering Regular Expressions, Second Edition, by ...
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