Can someone please explain this code line-by-line for me...I am a newbie [closed]

import re
import json
import requests
from textwrap import shorten


url = "https://www.coursera.org/specializations/digital-manufacturing-design-technology#courses"
html_doc = requests.get(url).text
data = json.loads(
    re.search(r"window.__APOLLO_STATE__ = (.*});", html_doc).group(1)
)

please explain what the group() function does and what does its arguements signify?(1/2/3 etc..) what is APOLLO_STATE ??

uncomment to print all data:

print(json.dumps(data, indent=4))

i = 1
for k, v in data.items():
    if "SDPCourse:" in k and "." not in k:
        print(
            "{:<3} {:<8} {:<60} {}".format(
                i,
                v["averageInstructorRating"],
                v["name"],
                shorten(v["description"], 40),
            )
        )
        i += 1