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PORegex for URL routing - match alphanumeric and dashes except words in this list
 

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    <p>I'm using CodeIgniter to write an app where a user will be allowed to register an account and is assigned a URL (URL slug) of their choosing (ex. domain.com/user-name). CodeIgniter has a URL routing feature that allows the utilization of regular expressions (<a href="http://ellislab.com/codeigniter/user-guide/general/routing.html" rel="nofollow">link</a>).</p> <p>User's are only allowed to register URL's that contain alphanumeric characters, dashes (-), and under scores (_). This is the regex I'm using to verify the validity of the URL slug: <code>^[A-Za-z0-9][A-Za-z0-9_-]{2,254}$</code></p> <p>I am using the url routing feature to route a few url's to features on my site (ex. <code>/home -&gt; /pages/index</code>, <code>/activity -&gt; /user/activity</code>) so those particular URL's obviously cannot be registered by a user. </p> <p>I'm largely inexperienced with regular expressions but have attempted to write an expression that would match any URL slugs with alphanumerics/dash/underscore except if they are any of the following: </p> <ol> <li>default_controller</li> <li>404_override</li> <li>home</li> <li>activity</li> </ol> <p>Here is the code I'm using to try to match the words with that specific criteria: </p> <pre><code>$route['(?!default_controller|404_override|home|activity)[A-Za-z0-9][A-Za-z0-9_-]{2,254}'] = 'view/slug/$1'; </code></pre> <p>but it isn't routing properly. Can someone help? (side question: is it necessary to have <code>^</code> or <code>$</code> in the regex when trying to match with URL's?)</p>
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