Email id checker

Here is a simple email ID checker script in Python:

import re

def check_email(email):
    email_regex = r"^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$"
    if re.match(email_regex, email):
        return True
    else:
        return False

email = input("Enter email ID: ")
if check_email(email):
    print("Valid email ID")
else:
    print("Invalid email ID")

This script uses a regular expression to check if the email ID is valid. The regular expression used is:

^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$

This regular expression matches the following:

• ^ asserts the start of the line
• [a-zA-Z0-9_.+-]+ matches one or more of the following characters: letters (both uppercase and lowercase), numbers, dot (.), hyphen (-), underscore (_), plus sign (+)
• @ matches the @ symbol
• [a-zA-Z0-9-]+ matches one or more of the following characters: letters (both uppercase and lowercase), numbers, hyphen (-)
• \. matches the dot (.) character
• [a-zA-Z0-9-.]+ matches one or more of the following characters: letters (both uppercase and lowercase), numbers, dot (.), hyphen (-)
• $ asserts the end of the line

If the email ID matches this regular expression, the function returns True, otherwise it returns False.

You can run this script and enter an email ID to check if it's valid or not.