分组与捕获

Python 中的正则表达式

Maria Eugenia Inzaugarat

Data Scientist

字符分组

re.findall(r'[A-Za-z]+\s\w+\s\d+\s\w+', text)

['Clary has 2 friends', 'Susan has 3 brothers', 'John has 4 sisters']

re.findall(r'([A-Za-z]+)\s\w+\s\d+\s\w+', text)

['Clary', 'Susan', 'John']

re.findall(r'([A-Za-z]+)\s\w+\s(\d+)\s(\w+)', text)

[('Clary', '2', 'friends'),
 ('Susan', '3', 'brothers'),
 ('John', '4', 'sisters')]

pets = re.findall(r'([A-Za-z]+)\s\w+\s(\d+)\s(\w+)', "Clary has 2 dogs but John has 3 cats")

pets[0][0]

'Clary'

re.search(r"(\d[A-Za-z])+", "My user name is 3e4r5fg")

<re.Match object; span=(16, 22), match='3e4r5f'>

my_string = "My lucky numbers are 8755 and 33"
re.findall(r"(\d)+", my_string)

['5', '3']

re.findall(r"(\d+)", my_string)

['8755', '33']

Python 中的正则表达式