Use curly braces: 
${1}n

[download]

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

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

[download]

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

In reply to Re: mark end of variable name (e.g.$1) by choroba
in thread mark end of variable name (e.g.$1) by Anonymous Monk

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