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my @captures = 'abcde' =~ m[(.){3}];
print "@captures";;
c

my @captures = 'abcde' =~ m[(.)(.)(.)];;
print "@captures";;
a b c

'abcde' =~ m[(.){3}] and print "$1,$2,$3";;
Use of uninitialized value in concatenation (.) or string at ...
...

'abcde' =~ m[(.)(.)(.)] and print "$1,$2,$3";;
a,b,c