sisyphus@sisyphus5-desktop:~$ echo $_
PATH
$ perl -le "$_=~/sub mymy\{}/;" # No error here
$ echo $_
PATH=~/sub mymy\{}/;
$ perl -le "$_=~/sub mymy\{}/;"
Backslash found where operator expected at -e line 1, near "mymy\"
syntax error at -e line 1, near "mymy\"
Execution of -e aborted due to compilation errors.