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$0
Combined from primary sources listed below.

In Variables§

See primary documentation in context for Positional attributes

$/ can have positional attributes if the Regex had capture-groups in it, which are just formed with parentheses.

'abbbbbcdddddeffg' ~~ / a (b+) c (d+ef+) g /;
say $/[0]; # OUTPUT: «｢bbbbb｣␤» 
say $/[1]; # OUTPUT: «｢dddddeff｣␤»

These can also be accessed by the shortcuts $0, $1, $2, etc.

say $0; # OUTPUT: «｢bbbbb｣␤» 
say $1; # OUTPUT: «｢dddddeff｣␤»

To get all of the positional attributes, you can use $/.list or @$/. Before 6.d, you can also use the @() shortcut (no spaces inside the parentheses).

say @$/.join; # OUTPUT: «bbbbbdddddeff␤» 
 
# 6.c language only: 
say @().join; # OUTPUT: «bbbbbdddddeff␤»

This magic behavior of @() has been deprecated as of 6.d