Perl : Get array of all possible cases of a string

Question

I need to get an array of all possible cases of a string. Like it's written here:

Combination of all possible cases of a string

How do I do that in Perl efficiently?

I want something like this:

print "$_
" for GetCases('perl');

# Output:
perl
Perl
...
pERl
...
PERL

Note

I tagged glob because it's the function to which I want to feed the result, so people as me will later find the question. However, The question is not only about this particular case of usage.

Related question : Should I insert some code when asking for idea?

Answer 1

If you're aiming to use if for glob anyway then you can use glob's built-in pattern generation

my $filename = 'File.CSV';

my $test = $filename =~ s/([a-z])/sprintf '{%s,%s}', uc($1), lc($1)/iegr;

say $test, "
";
say for glob $test;

output

{F,f}{I,i}{L,l}{E,e}.{C,c}{S,s}{V,v}

FILE.CSV
FILE.CSv
FILE.CsV
FILE.Csv
FILE.cSV
FILE.cSv
FILE.csV
FILE.csv
FILe.CSV
FILe.CSv
FILe.CsV
FILe.Csv
FILe.cSV
FILe.cSv
FILe.csV
FILe.csv
FIlE.CSV
FIlE.CSv
FIlE.CsV
FIlE.Csv
FIlE.cSV
FIlE.cSv
FIlE.csV
FIlE.csv
FIle.CSV
FIle.CSv
FIle.CsV
FIle.Csv
FIle.cSV
FIle.cSv
FIle.csV
FIle.csv
FiLE.CSV
FiLE.CSv
FiLE.CsV
FiLE.Csv
FiLE.cSV
FiLE.cSv
FiLE.csV
FiLE.csv
FiLe.CSV
FiLe.CSv
FiLe.CsV
FiLe.Csv
FiLe.cSV
FiLe.cSv
FiLe.csV
FiLe.csv
FilE.CSV
FilE.CSv
FilE.CsV
FilE.Csv
FilE.cSV
FilE.cSv
FilE.csV
FilE.csv
File.CSV
File.CSv
File.CsV
File.Csv
File.cSV
File.cSv
File.csV
File.csv
fILE.CSV
fILE.CSv
fILE.CsV
fILE.Csv
fILE.cSV
fILE.cSv
fILE.csV
fILE.csv
fILe.CSV
fILe.CSv
fILe.CsV
fILe.Csv
fILe.cSV
fILe.cSv
fILe.csV
fILe.csv
fIlE.CSV
fIlE.CSv
fIlE.CsV
fIlE.Csv
fIlE.cSV
fIlE.cSv
fIlE.csV
fIlE.csv
fIle.CSV
fIle.CSv
fIle.CsV
fIle.Csv
fIle.cSV
fIle.cSv
fIle.csV
fIle.csv
fiLE.CSV
fiLE.CSv
fiLE.CsV
fiLE.Csv
fiLE.cSV
fiLE.cSv
fiLE.csV
fiLE.csv
fiLe.CSV
fiLe.CSv
fiLe.CsV
fiLe.Csv
fiLe.cSV
fiLe.cSv
fiLe.csV
fiLe.csv
filE.CSV
filE.CSv
filE.CsV
filE.Csv
filE.cSV
filE.cSv
filE.csV
filE.csv
file.CSV
file.CSv
file.CsV
file.Csv
file.cSV
file.cSv
file.csV
file.csv