Not stupid -- except (some would argue) for the failure to use strict, warnings and some prints -- and clumsy (IMO) only in your indentation.

That said, the following seems to be what you want. More commentary follows:

#!/usr/bin/perl -w
use strict;
use 5.018;
# 1157516


my $sp = ".A(~(B & C & ( D | (E & F) ))),";  

# $pin = string between . and (
if ( $sp =~ /\.(.*?)\(/ ) {
   my $pin  = $1;
   say "|-- $pin --|\n";
}
 
my $sig;
# if ( $sp =~ /\((.*?)\)/ ) {
if ( $sp =~ /\(
             (.*?\){2})
             .*/x
             ) {    
   $sig = $1;
   }

say "\t|-> $sig <-|";
[download]

The /x modifer isn't necessary; it merely makes it easier to read the second regex; the use of the quantifier lets the regex capture all but the last ")" (the space between the one which trails "F" before the 3 parens leaves the one after the "F" out of consideration).

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