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WordPress auto corrects the permalinks(URLs) even if it is entered incorrectly. For e.g. WordPress will land you in example.com/some-post even if you enter example.com/idontexist/some-post or even example.com/some

It could be that, WordPress uses RegEx like or some matching algorithm that compares from right to left and if it finds a match, it will take you to the page even if there are /.*/ left on the left. Just a guess! How does WordPress do this?

Edit: I also noticed that the .htaccess file checks for virtual file/directories using !f and !d and redirects the request to index.php on the blog folder.

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up vote 5 down vote accepted

The redirect_canonical function in /wp-includes/canonical.php is called on any given URL and will attempt to best-guess the URL the user wanted, and redirect them to there, when a URL does not exist. It has a whole huge amount of code to do this for all sorts of common errors.

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Upvoted for "whole huge amount" :D. – tnorthcutt Jun 8 '11 at 18:25

Use @JanFabry "Rewrite Analyzer" Plugin, over here in the "official" WPSE Plugin repository

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Thanks for the link – Lobo Jun 9 '11 at 3:53

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