Roy Williams added the comment:
Repro:
```
import re
re.compile(br'^(.*?)$(?m)')
```
Results in
```
Traceback (most recent call last):
File "test_compile.py", line 2, in <module>
re.compile(br'^(.*?)$(?m)')
File "/usr/lib/python3.6/re.py", line 233, in compile
return _compile(pattern, flags)
File "/usr/lib/python3.6/re.py", line 301, in _compile
p = sre_compile.compile(pattern, flags)
File "/usr/lib/python3.6/sre_compile.py", line 562, in compile
p = sre_parse.parse(p, flags)
File "/usr/lib/python3.6/sre_parse.py", line 856, in parse
p = _parse_sub(source, pattern, flags & SRE_FLAG_VERBOSE, False)
File "/usr/lib/python3.6/sre_parse.py", line 415, in _parse_sub
itemsappend(_parse(source, state, verbose))
File "/usr/lib/python3.6/sre_parse.py", line 741, in _parse
' (truncated)' if len(source.string) > 20 else '',
BytesWarning: str() on a bytes instance
```
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30605>
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