-Checking- {sCity}/{sCategory} --> #^/([a-z]{1})/(.+?)/(.+?)(?:/|$)# : /a/4101592/animals--<pre>Array
(
    [0] => /a/4101592/animals
    [1] => a
    [2] => 4101592
    [3] => animals
)
</pre><!-- 0.00182318687439 seg. -->