Anidamiento de /e

   1 #!/usr/bin/perl 
   2 $a ="one";
   3 $b = "two";
   4 $_ = '$a $b';
   5 print "_ = $_\n\n";
   6 s/(\$\w+)/$1/ge;
   7 print "After 's/(\$\w+)/$1/ge' _ = $_\n\n";
   8 s/(\$\w+)/$1/gee;
   9 print "After 's/(\$\w+)/$1/gee' _ = $_\n\n";

El resultado de la ejecución es:

 
> enested.pl
_ = $a $b
 
After 's/($w+)/$b/ge' _ = $a $b
 
After 's/($w+)/$b/gee' _ = one two