$s1_i = 'корп\.';
$preg_expression = "#[^,]*$s1_i[^,]*#Uu";
Parse error: syntax error, unexpected '^', expecting '-' or identifier (T_STRING) or variable (T_VARIABLE) or number (T_NUM_STRING) in G:\OpenServer\domains\crds\mycomponents\office_func.php on line 95