Python正则表达式仅匹配整个字符串[重复]

Python正则表达式仅匹配整个字符串

python
import re
pattern = r"^hello$"
string1 = "hello"
string2 = "hello world"
result1 = re.match(pattern, string1)
result2 = re.match(pattern, string2)
print(result1)  # 
print(result2)  # None

python
import re
pattern = r"^hello.*$"
string1 = "hello world"
string2 = "hello, how are you?"
result1 = re.match(pattern, string1)
result2 = re.match(pattern, string2)
print(result1)  # 
print(result2)  #