SyntaxWarning in the console for invalid escape sequences.

[mattcoleanderson]

In Autodoist 2.0 the following is logged in the console:

docker run -it mattcoleanderson/autodoist
/usr/src/app/./autodoist.py:686: SyntaxWarning: invalid escape sequence '\s'
  regex_a = '(^[*]{2}\s*)(.*)'
/usr/src/app/./autodoist.py:687: SyntaxWarning: invalid escape sequence '\-'
  regex_b = '(^\-\*\s*)(.*)'
/usr/src/app/./autodoist.py:1369: SyntaxWarning: invalid escape sequence '\d'
  'start=(\d{2}[-]\d{2}[-]\d{4})', task.content)
/usr/src/app/./autodoist.py:1392: SyntaxWarning: invalid escape sequence '\d'
  'start=due-(\d+)([dw])', task.content)

This SyntaxWarning occurs because Python attempts to evaluate escape sequences in string literals. However, regex has many uses for backslashes that aren't valid escape sequences.

We can get rid of this SyntaxWarning by prepending the string literal with an r. This makes a "raw string" which tells python to interpret the string literally.

[mattcoleanderson]

I've gone ahead and opened a quick PR to prepend "r" to the 4 regex strings causing the Syntax Warning.