$ perl -de1

Loading DB routines from perl5db.pl version 1.53
Editor support available.

Enter h or 'h h' for help, or 'man perldebug' for more help.

main::(-e:1):	1
  DB<1> $str =  '\\x{A3f4}'                                                     

  DB<2> p $str                                                                  
\x{A3f4}