Select Code to Download

 ee Execute right side as code then eval the
resulting string.

ee Evaluate the right side as a string then eval the
result.

lanx@lanx-1005HA:~$ perl -MO=Terse -e ' s/(x)/$1.$1/ree '
LISTOP (0x9f99668) leave [1] 
...
                            UNOP (0x9fa2c18) null [15] 
                                PADOP (0x9fa2c98) gvsv  GV (0x9fd4c90)
+ *1 
-e syntax OK