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PONegating certain words from a custom rewrite expression?
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copied!<p>I have a WP page named Book (/book/) which displays a book in various languages. The language and chapter variables are passed as query variables. So the URL structure looks like:</p> <p>/book/english/ (This displays a list of chapters in English) /book/english/foreword/ (This displays the Foreword of the book in English)</p> <p>Here is what I have come up with:</p> <pre><code>add_action('init', 'book_init'); add_filter('rewrite_rules_array', 'book_rewrite_rules_array'); add_filter('query_vars', 'book_query_vars'); function book_init() { global $wp_rewrite; $wp_rewrite->flush_rules(); } function book_rewrite_rules_array($rewrite_rules) { global $wp_rewrite; $custom['(book)/(.+)/(.+)$'] = 'index.php?pagename=$matches[1]&book_language=$matches[2]&book_chapter=$matches[3]'; $custom['(book)/(.+)$'] = 'index.php?pagename=$matches[1]&book_language=$matches[2]'; return $custom + $rewrite_rules; } function book_query_vars($query) { array_push($query, 'book_language', 'book_chapter'); return $query; } </code></pre> <p>Everything is working but the problem is that, the rewrite rules I have added are also catching /book/feed/ which I don't want. So I am looking for an expression which would negate feed from '(book)/(.+)/(.+)$' and '(book)/(.+)$'</p> <p>Also I want to know, if assume the query variables supplied are invalid, which filter should I use to check this in and how can I stop WP from continuing and instead make it send a 404 error and have it show the 404 page?</p>

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