Description of problem:
This happens when running "rpl" to delete something:

  rpl "asdf" ""

will do.

Version-Release number of selected component:
rpl-1.5.7-4.fc27

Additional info:
reporter:       libreport-2.9.3
cmdline:        /usr/bin/python3 -s /usr/bin/rpl asdf '' test
crash_function: main
exception_type: NameError
executable:     /usr/bin/rpl
kernel:         4.15.14-300.fc27.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
rpl:172:main:NameError: name 'raw_input' is not defined

Traceback (most recent call last):
  File "/usr/bin/rpl", line 314, in <module>
    main()
  File "/usr/bin/rpl", line 172, in main
    line = raw_input()
NameError: name 'raw_input' is not defined

Local variables in innermost frame:
file: 'test'
files: ['test']
new_str: ''
old_str: 'asdf'
args: ['asdf', '', 'test']
opts: <Values at 0x7fcd84e23780: {'suffixen': [], 'ignore_case': False, 'whole_words': False, 'do_backup': False, 'quiet': False, 'verbose': False, 'dry_run': False, 'recurse': False, 'escapes': False, 'prompt': False, 'force': False, 'keep_times': False, 'use_tmpdir': False, 'hidden_files': False}>
parser: <optparse.OptionParser object at 0x7fcd8d7182b0>
usage: 'usage: %prog [options] old_string new_string target_file(s)'