In [1]:

    

import re


    

In [2]:

    

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


    

In [3]:

    

result = re.sub(r'[a-z]+@[a-z]+\.com', 'new-address', s)
print(result)


    

    




new-address, new-address, ccc@zzz.net

In [4]:

    

print(type(result))


    

    




<class 'str'>

In [5]:

    

result = re.sub(r'([a-z]+)@([a-z]+)\.com', r'\1@\2.net', s)
print(result)


    

    




aaa@xxx.net, bbb@yyy.net, ccc@zzz.net

In [6]:

    

result = re.sub(r'(?P<local>[a-z]+)@(?P<SLD>[a-z]+)\.com', r'\g<local>@\g<SLD>.net', s)
print(result)


    

    




aaa@xxx.net, bbb@yyy.net, ccc@zzz.net

In [7]:

    

result = re.sub(r'[a-z]+@[a-z]+\.com', 'new-address', s, count=1)
print(result)


    

    




new-address, bbb@yyy.com, ccc@zzz.net

In [8]:

    

result = re.subn(r'[a-z]+@[a-z]+\.com', 'new-address', s)
print(result)


    

    




('new-address, new-address, ccc@zzz.net', 2)

In [9]:

    

print(result[0])


    

    




new-address, new-address, ccc@zzz.net

In [10]:

    

print(result[1])


    

    




2

In [11]:

    

result = re.subn(r'(?P<local>[a-z]+)@(?P<SLD>[a-z]+)\.com', r'\g<local>@\g<SLD>.net', s)
print(result)


    

    




('aaa@xxx.net, bbb@yyy.net, ccc@zzz.net', 2)

In [12]:

    

result = re.subn(r'[a-z]+@[a-z]+\.com', 'new-address', s, count=1)
print(result)


    

    




('new-address, bbb@yyy.com, ccc@zzz.net', 1)