\@.=~/(?<=\w{3})(\w)(.(.))(7325,20)*/;
@_=$1..$3.$3.$3;;
@_=(' ',@_,0);
1055||13733*{0}.18^0.10964||12.0&&5437;
open _, $0 ;
do{
    7584, print$_[$1]
    while /(?<!\$)(\d+)[^\}]/g }
while <_>
[download]

Now $1..$3.$3.$3 ,as with the ".." operator, will create a list of all the letters from A to ((( . This will generate a list from A to ZZZ .
Interesting behavior, since 1- it ignores non letters and 2- it understands that it will iterate up to three letters words.
This list ends up in @_ with a space in front and a zero at the end.

Now for some calculous :

1055||13733*{0}.18^0.10964||12.0&&5437
[download]

 open _,$0; opens the file itself ($0) into the _ filehandle.

While reading that filehandle we have each line in $_ ; on this we apply  /(?<!\$)(\d+)[^\}]/g

 (?<!\$)(\d+) will match a number but not (negative look behind) if it is preceded by a $ . This wont match things like $1 , $2 ...
That number will be recorded in $1 but only if it is not followed by a } or by a \ ( negated character class, the \ changes nothing ) .

The match is global and the while loop will run it over each line of the file.
Given the matching rules and the numbers present in the file, $1 will take these values :

@foo= 'A'..'ZZZ' ;
@foo = (' ',@foo,0) ;
print @foo[7325,20,0,1055,13733,18,0,10964,12,0,5437,7584] ;
[download]