added regex to handle opening brace of a code block
semi-working implementation

it isn't catching all of the opening parentheses, and there issue of <4
spaces><tab> instead of just <4 spaces> has cropped up again
performed a diff between test and output using the old, apparently working implementation
added some print lines for debugging--still confused
you need to work on the opening_brace regex
added test for opening brace regex

...but it failed, although I think I see where the issue lies