When allowing the emdedding of code (loosely defined), provide an escape mechanism!!! For example,

When adding your escape mechanism, careful not to break existing functionality. For example,

Update: A solution is to replace 

$to =~ s/\$(\d+)/$a[$1-1]/g;

[download]

with 

$to =~ s/\\(.)|\${(\d+)})|\$(\d+)/
   (defined $1
      ? $1
      : (defined $2
           ? $a[$2-1]
           : $a[$3-1]
        )
   )
/eg;

[download]

In reply to Re^2: How to do regex backreferences within $variable replacement text? by ikegami
in thread How to do regex backreferences within $variable replacement text? by ManFromNeptune

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