Updated Course ID Regex

This regex is a bit more lax and will allow for hyphens and other characters in course ids.

@rocha @dsjen
The version I use in pipeline is taken from the LMS:

# from lms/envs/common.py:
COURSE_KEY_PATTERN = r'(?P<course_key_string>[^/+]+(/|\+)[^/+]+(/|\+)[^/]+)'
COURSE_ID_PATTERN = COURSE_KEY_PATTERN.replace('course_key_string', 'course_id')