<?php $string = '$quant*($c_paper+$c_color)+$quant*$c_lam+$quant*$c_big+$c_cut'; $pattern = '/\$([a-z\_]+)/';
Standard input is empty
8 Array ( [0] => quant [1] => c_paper [2] => c_color [3] => quant [4] => c_lam [5] => quant [6] => c_big [7] => c_cut )