It might be useful to protect against infinite recursion as well: 
my $max_recurs = 10;
$max_recurs-- while $string =~ ... && $max_recurs;

warn "Too many recursive substitutions on '$string'" 
     if !$max_recurs && $^W;

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In reply to Re: Infinite Recursion of a String by Fastolfe
in thread Double Interpolation of a String by chromatic

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