in reply to mark end of variable name (e.g.$1)

Use curly braces: 
${1}n

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Update: But you don't need them for $1n:

$ perl -wE 'say "abc" =~ s/(b)/$1n/r'
abnc

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

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Re^2: mark end of variable name (e.g.$1)
by Anonymous Monk on Feb 21, 2023 at 12:04 UTC
    Thanks for your answer !
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