import re
string_1 = "Stallaresvei s 10013.pdf"
regexp = r"(?<=\s)[a-zA-Z.]+(?=[\s0-9]+\.pdf)|(?<=\s)[0-9]+(?=\.pdf)"
m = re.findall(regexp, string_1)
print(m)
aW1wb3J0IHJlCnN0cmluZ18xID0gIlN0YWxsYXJlc3ZlaSBzIDEwMDEzLnBkZiIKcmVnZXhwID0gciIoPzw9XHMpW2EtekEtWi5dKyg/PVtcczAtOV0rXC5wZGYpfCg/PD1ccylbMC05XSsoPz1cLnBkZikiCm0gPSByZS5maW5kYWxsKHJlZ2V4cCwgc3RyaW5nXzEpCnByaW50KG0p