--- nawiasy klamrowe ---

import re

pattern = r"0{1,20}$"

if re.match(pattern, "000"):
   print("Rzad wielkosci x^3")

if re.match(pattern, "000000"):
   print("Rzad wielkosci x^6")

if re.match(pattern, "000000000"):
   print("Rzad wielkosci x^9")

if re.match(pattern, "000000000000"):
   print("Rzad wielkosci x^12")

if re.match(pattern, "000000000000000"):
   print("Rzad wielkosci x^15")

if re.match(pattern, "000000000000000000"):
   print("Rzad wielkosci x^18")

if re.match(pattern, "000000000000000000000"):
   print("Rzad wielkosci x^21")

--- wyrazenia regularne ---

import re

pattern = r"spam"

if re.search(pattern, "tutaj jest spam"):
    print(re.search(pattern, "tutaj jest spam").span().__getitem__(1))
else:
    print("nie znaleziono spamu")

print("-----")

pattern = r"spam"

match = re.search(pattern, "tutaj jest spam")
if match:
   print(match.group())
   print(match.start())
   print(match.end())
   print(match.span())

--- znajdz i zamien ---

import re

str = "Kolor tego przedmiotu to czarny"
pattern = r"czarny"
newstr = re.sub(pattern, "czerwony", str)
print(newstr)

print("-----")

pattern = r"cz..ny"

if re.match(pattern, "czerwony"):
   print("Polaczenie 1")

if re.match(pattern, "czarny"):
   print("Polaczenie 2")

print("-----")

pattern = r"^cz..ny$"

if re.match(pattern, "czerwony"):
   print("Polaczenie 1")

if re.match(pattern, "czarny"):
   print("Polaczenie 2")