Basic usage of the output class

usage.php

<?php
# Uses the default rules

echo Output::parse($input);
echo Output::factory($input)->get();

# Remove some rules

echo Output::factory($input)->remove_rules(array('em', 'strong'))->get();

# Add and update some rules

echo Output::factory($input)
    ->update_rules(array(
        'underline' => array('/\_+\s*([^\_\n]*[^\_\s])\s*\_+/' => '<span class="underline">\1</span'),
        'em'        => array('/\'+\s*([^\'\n]*[^\'\s])\s*\'+/' => '<em>\1</em>'),
    ))
    ->get();