import re

regex = r"^Material:\s*(.+)"

s = ("Color: Maroon Red\n"
            "Height: 187cm\n"
            "Number Of Seats: 6\n"
            "Number Of Wheels: 4\n"
            "Material: Aluminum\n"
            "Brand: Toyota \n"
            "#and hundreds of more lines...")

match = re.search(regex, s, re.MULTILINE)
if match:
    my_var = match.group(1)
    print(my_var)