match = re.search(r'\d+', 'The price is 100 dollars')
if match:
print(match.group()) # Output: 100
match = re.match(r'\d+', '123 apples')
if match:
print(match.group()) # Output: 123
match = re.fullmatch(r'\d+', '12345')
if match:
print(match.group()) # Output: 12345
matches = re.findall(r'\d+', 'There are 12 apples and 5 oranges')
print(matches) # Output: ['12', '5']
matches = re.finditer(r'\d+', 'There are 12 apples and 5 oranges')
for match in matches:
print(match.group()) # Output: 12 5