In [1]:

    

import re


    

In [2]:

    

s = 'aaa@xxx.com, bbb@yyy.com, ccc@zzz.net'


    

In [3]:

    

result = re.findall(r'[a-z]+@[a-z]+\.[a-z]+', s)
print(result)


    

    




['aaa@xxx.com', 'bbb@yyy.com', 'ccc@zzz.net']

In [4]:

    

print(len(result))


    

    




3

In [5]:

    

result = re.findall(r'([a-z]+)@([a-z]+)\.([a-z]+)', s)
print(result)


    

    




[('aaa', 'xxx', 'com'), ('bbb', 'yyy', 'com'), ('ccc', 'zzz', 'net')]

In [6]:

    

result = re.findall(r'(([a-z]+)@([a-z]+)\.([a-z]+))', s)
print(result)


    

    




[('aaa@xxx.com', 'aaa', 'xxx', 'com'), ('bbb@yyy.com', 'bbb', 'yyy', 'com'), ('ccc@zzz.net', 'ccc', 'zzz', 'net')]

In [7]:

    

result = re.findall('[0-9]+', s)
print(result)


    

    




[]

In [8]:

    

s = 'aaa@xxx.com, bbb@yyy.com, ccc@zzz.net'


    

In [9]:

    

result = re.finditer(r'[a-z]+@[a-z]+\.[a-z]+', s)
print(result)


    

    




<callable_iterator object at 0x10b0efa90>

In [10]:

    

print(type(result))


    

    




<class 'callable_iterator'>

In [11]:

    

for m in result:
    print(m)


    

    




<re.Match object; span=(0, 11), match='aaa@xxx.com'>
<re.Match object; span=(13, 24), match='bbb@yyy.com'>
<re.Match object; span=(26, 37), match='ccc@zzz.net'>

In [12]:

    

l = list(re.finditer(r'[a-z]+@[a-z]+\.[a-z]+', s))
print(l)


    

    




[<re.Match object; span=(0, 11), match='aaa@xxx.com'>, <re.Match object; span=(13, 24), match='bbb@yyy.com'>, <re.Match object; span=(26, 37), match='ccc@zzz.net'>]

In [13]:

    

print(l[0])


    

    




<re.Match object; span=(0, 11), match='aaa@xxx.com'>

In [14]:

    

print(type(l[0]))


    

    




<class 're.Match'>

In [15]:

    

print(l[0].span())


    

    




(0, 11)

In [16]:

    

print([m.span() for m in re.finditer(r'[a-z]+@[a-z]+\.[a-z]+', s)])


    

    




[(0, 11), (13, 24), (26, 37)]

In [17]:

    

result = re.finditer(r'[a-z]+@[a-z]+\.[a-z]+', s)


    

In [18]:

    

for m in result:
    print(m)


    

    




<re.Match object; span=(0, 11), match='aaa@xxx.com'>
<re.Match object; span=(13, 24), match='bbb@yyy.com'>
<re.Match object; span=(26, 37), match='ccc@zzz.net'>

In [19]:

    

print(list(result))


    

    




[]