Update regex section
Update regex section

Add link to regexr.com

noisebridge/PythonClass,PyClass/PyClassLessons,razzius/PyClassLessons,noisebridge/PythonClass,PyClass/PyClassLessons,razzius/PyClassLessons,noisebridge/PythonClass,PyClass/PyClassLessons,razzius/PyClassLessons,razzius/PyClassLessons,noisebridge/PythonClass