preg_replace question

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i have this variables:
$url = '/products/computers/_es/';
$pat = '/(_[a-zA-Z]{2})/';
$rep = '';

i need to get rid of the '_xx/' part. with that $pat pattern, a
preg_replace($pat,$rep,$url) returns '/products/computers//'

and worst, if the $url changes to '/products/_es/computers/' it
returns '/products//computers/' while it should'nt to ANYTHING at all.

the preg_replace must only work when the _XX/ is at the end of the $url.

i need help in that, thanks!
andres


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