例如：
import re
pattern = r"[^A-Z]"
if re.search(pattern, "this is all quiet"):
print("Match 1")
if re.search(pattern, "AbCdEfG123"):
print("Match 2")
if re.search(pattern, "THISISALLSHOUTING"):
print("Match 3")
结果：
>>> Match 1 Match 2 >>>