Bug with regex substitutions. When calling the re.sub() method directly
char(92), the double backslash charecter as the replacement, throws an
exception. Whereas compiling a regex object then calling its own .sub()
method works completely fine. I did a quick look through the bug tracker 
search for similar issues and none were reported.

# Breaks
re.sub(r'\\\\', chr(92), stringy_thingy)

vs 

# Works
parser = re.compile(r'\\\\')
parser.sub(chr(92), stringy_thingy)

# Where stringy_thingy is a string that is being substituted