c:\@Work\Perl\monks>perl -wMstrict -le
"use 5.010;
 ;;
 my $s = '(12,4666,{xyx,yyy,ab1{1213,34343},3433,xy1[{3232,989},{8737,933}],3343,pq1[{1212,989}],98383},8383,xty)';
 print qq{'$s'};
 ;;
 my $curly_grp  = qr{ { \d+ (?: , \d+)* } }xms;
 my $curly_grps = qr{ $curly_grp (?: , $curly_grp)* }xms;
 my $string = qr{ [[:alpha:]] [[:alnum:]]+ }xms;
 ;;
 $s =~ s{
   $string    \K ($curly_grp)
   |
   $string \[ \K ($curly_grps) (?= \])
   }
   { (my $one = ($1 // $2)) =~ s{,}{|}xmsg;  $one; }xmsge;
 print qq{'$s'};
"
'(12,4666,{xyx,yyy,ab1{1213,34343},3433,xy1[{3232,989},{8737,933}],3343,pq1[{1212,989}],98383},8383,xty)'
'(12,4666,{xyx,yyy,ab1{1213|34343},3433,xy1[{3232|989}|{8737|933}],3343,pq1[{1212|989}],98383},8383,xty)'