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:samespace
Combined from primary sources listed below.

In Regexes§

See primary documentation in context for Samespace

The :samespace or :ss substitution modifier implies the :sigspace modifier for the regex, and in addition, copies the whitespace from the matched string to the replacement string:

say S:samespace/a ./c d/.raku given "a b";      # OUTPUT: «"c d"␤» 
say S:samespace/a ./c d/.raku given "a\tb";     # OUTPUT: «"c\td"␤» 
say S:samespace/a ./c d/.raku given "a\nb";     # OUTPUT: «"c\nd"␤» 

The ss/.../.../ syntactic form is a shorthand for s:samespace/.../.../.