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<?php $amount = 5; $stuff = '<div><div class="rev_slider_2_2_wrapper"></div><i id="rev_slider_2_2_wrapper"></i></div>'; $stuff = preg_replace( "/rev_slider_(\d+)_(\d+)_wrapper/i", "rev_slider_$1_{$amount}", $stuff ); print_r( $stuff );

preferences:
34.03 ms | 402 KiB | 5 Q