regexp split string by commas and spaces, but ignore the inside quotes and parentheses

Question

I need split string by commas and spaces, but ignore the inside quotes, single quotes and parentheses

$str = \"Questions, \\\"Quote\\\",\'single quote\',\'co         


        

Answer 1

This will work only for non-nested parentheses:

    $regex = <<

The ++ and *+ will consume as much as they can and give nothing back for backtracking. This technique is described in perlre(1) as the most efficient way to do this kind of matching.