preg replace - Why preg_replace() function isn't working properly? -


my php script is:

<?php     $string = '{controller}/{action}';     $pattern = '/\{([a-z]+)\}/i';     $replacement = '(?p<$1>[a-z-]+)';     echo preg_replace($pattern, $replacement, $string); ?>

it showing result:

(?p[a-z-]+)\/(?p[a-z-]+)

i expecting this:

(?p<controller>[a-z-]+)\/(?p<action>[a-z-]+)

how can able this??


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