Traceback (most recent call last):
File "./prog.py", line 4, in <module>
File "/usr/lib/python3.7/re.py", line 192, in sub
return _compile(pattern, flags).sub(repl, string, count)
File "/usr/lib/python3.7/re.py", line 286, in _compile
p = sre_compile.compile(pattern, flags)
File "/usr/lib/python3.7/sre_compile.py", line 764, in compile
p = sre_parse.parse(p, flags)
File "/usr/lib/python3.7/sre_parse.py", line 930, in parse
p = _parse_sub(source, pattern, flags & SRE_FLAG_VERBOSE, 0)
File "/usr/lib/python3.7/sre_parse.py", line 426, in _parse_sub
not nested and not items))
File "/usr/lib/python3.7/sre_parse.py", line 651, in _parse
source.tell() - here + len(this))
re.error: nothing to repeat at position 2