In [1]:

    

import re


    

In [2]:

    

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


    

In [3]:

    

m = re.match(r'[a-z]+@[a-z]+\.com', s)
print(m)


    

    




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

In [4]:

    

m = re.match(r'[a-z]+@[a-z]+\.net', s)
print(m)


    

    




None

In [5]:

    

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


    

In [6]:

    

m = re.search(r'[a-z]+@[a-z]+\.net', s)
print(m)


    

    




<re.Match object; span=(26, 37), match='ccc@zzz.net'>

In [7]:

    

m = re.search(r'[a-z]+@[a-z]+\.com', s)
print(m)


    

    




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

In [8]:

    

s = 'aaa@xxx.com'


    

In [9]:

    

m = re.fullmatch(r'[a-z]+@[a-z]+\.com', s)
print(m)


    

    




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

In [10]:

    

s = '!!!aaa@xxx.com!!!'


    

In [11]:

    

m = re.fullmatch(r'[a-z]+@[a-z]+\.com', s)
print(m)


    

    




None

In [12]:

    

s = '!!!aaa@xxx.com!!!'


    

In [13]:

    

m = re.match(r'[a-z]+@[a-z]+\.com$', s)
print(m)


    

    




None