Without the /x modifier, a space should match literally. What's the output of 
perl -lwe 'print qq( $]) =~ s/ /v/r'

[download]
(use double quotes instead on MSWin)

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re^3: simplifying substitution by choroba
in thread simplifying substitution by Konabob

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