Matching a regex - php

Question

My regex skills are poor. For my js/css to show the correct menu I am adding in a "selected" class to my li so that the js knows which is the current item (so it can display the rest of the drop down).
My problem is matching the correct uri string in codeigniter:
<li <? if((strstr($this->uri->uri_string(),"rfid_finder/finder")) || (strstr($this->uri->uri_string(),"finder"))) {?>class="selected"<?}?> rel="home"> <?= anchor('finder','HOME')?></li>
I was using this method initially but my routes are now a bit more complex to allow for searching and pagination.
I need a regex that would match all of the following routes:
$route['finder/(:any)/(:any)/(:num)'] = "rfid_finder/finder/$1/$2/$3";
$route['finder/(:any)/(:any)'] = "rfid_finder/finder/$1/$2";
$route['finder/(:any)'] = "rfid_finder/finder/$1";
$route['finder'] = 'rfid_finder/finder';
but when a user visits:
rfid_finder/search_form
the first menu is not given the selected class.
Update
I want first code snippet to match the routes and not the rfid_finder/search route- I have a second line of code which matches the rfid_finder/search_form route. my problem lies in trying to capture the route using (strstr($this->uri->uri_string(),"finder") it matches all my routes even the rfid_finder/search_form

Answer 1

Hmm, let me know if this works for you. It seems to work in my tests.
preg_match('|^(rfid_finder/)?finder/?([a-z0-9]+?)?(/[a-z0-9]+?)?(/\d+?)?$|i', $string)
Here's my testing example:
$route = array();
$route['finder/(:any)/(:any)/(:num)'] = "rfid_finder/finder/$1/$2/$3";
$route['finder/(:any)/(:any)'] = "rfid_finder/finder/$1/$2";
$route['finder/(:any)'] = "rfid_finder/finder/$1";
$route['finder'] = 'rfid_finder/finder';
$route['finder/2313'] = 'rfid_finder/finder';
$route['finder/asd/dsda'] = 'rfid_finder/finder';
$route['rfid_finder/finder/dd/122'] = 'rfid_finder/finder';
$route['rfid_finder/finder/dd/122/qwewe'] = 'rfid_finder/finder';
$route['rfid_finder/finder/dd/asdsad/333'] = 'rfid_finder/finder';
foreach ($route as $string=>$match) {
if ( preg_match('|^(rfid_finder/)?finder/?([a-z0-9]+?)?(/[a-z0-9]+?)?(/\d+?)?$|i', $string) ) {
echo $string.' - yes';
} else {
echo $string.' - no';
}
echo '<br />';
}
exit();
It searches the string to make sure it starts with either finder or rfid_finder (i wasn't really sure which you prefered. if you want it to only start with rfid_finder just remove the parentheses around rfid_finder and the trailing ? before finder)