emailchecker_regex.py

# Python program to validate an Email 
  
# import re module 
  
# re module provides support 
# for regular expressions 
import re 
  
# Make a regular expression 
# for validating an Email 
regex = '^[a-z0-9]+[\._]?[a-z0-9]+[@]\w+[.]\w{2,3}$'
# for custom mails use: '^[a-z0-9]+[\._]?[a-z0-9]+[@]\w+[.]\w+$' 
      
# Define a function for 
# for validating an Email 
def check(email):  
  
    # pass the regular expression 
    # and the string in search() method 
    if(re.search(regex,email)):  
        print("Valid Email")  
          
    else:  
        print("Invalid Email")  
      
  
# Driver Code  
if __name__ == '__main__' :  
      
    # Enter the email  
    email = "dude_tanmay326@gmail.com"
      
    # calling run function  
    check(email) 
  
    email = "my.ownsite@ourearth.org"
    check(email) 
  
    email = "ankitrai326.com"
    check(email)