php - preg_replace not replacing with ajax -

i have following code

$text = '["{!account__!http://localhost/mf/public/__notactivated}","email"]';  $replcmnt = array(     '#{!account__!http:\/\/localhost\/mf/public\/__notactivated}#' => 'text replace' );  $text = preg_replace(array_keys($replcmnt),$replcmnt,$text); 

i need output '["text replace","email"]' reason replace isn't replacing. find extremely weird works when load page doesn't work if run via ajax request o.o

i have note if remove slashes inner part between underscores replace takes place. problem must slashes.

ex.

$replcmnt = array(     '#{!account__!http:-localhost-mf-public-__notactivated}#' => 'text replace' ); 

the above replaced due lack of slashes, suppose.

any appreciated

edit:

here's data right before replace:

$text ["{!account__!http:\/\/localhost\/mf\/public\/__notactivated}","email"]  $replcmnt array (     [#{!account__!http:\/\/localhost\/mf\/public\/__notactivated}#] => long text ) 

use str_replace() rather preg_replace(), since you're not doing pattern matching.