Valid address
Validation of an email address.
A valid email address consists of an email prefix and an email domain, both in acceptable formats. The prefix appears to the left of the @ symbol. The domain appears to the right of the @ symbol. For example, in the address example@mail.com, "example" is the email prefix, and "mail.com" is the email domain. Basic validation of an address is carried out client-side before data is sent to be processed server-side.
Make
Write a program that validates an email address.
Use this boilerplate code as a starting point:
Success Criteria
Remember to add a comment before a subprogram, selection or iteration statement to explain its purpose.
Acceptable email prefix formats:
- Allowed characters: letters (a-z), numbers, underscores, periods, and dashes.
- An underscore, period, or dash must be followed by one or more letter or number.
Acceptable email domain formats:
- Allowed characters: letters, numbers, hyphen or period.
- The domain must be at least three characters, for example: .com, .org, .cc
Complete the subprogram called `validate` that:
- Returns True if the `email_address` is valid or False if not.
Complete the `main program` so that:
- The user can input the email address to check.
Typical inputs and outputs from the program would be:
Enter your email address: abc-@mail.com
Email address is invalid.
Enter your email address: abc-d@mail.com
Email address is valid.
Enter your email address: abc..def@mail.com
Email address is invalid.
Enter your email address: abc.def@mail.com
Email address is valid.
Enter your email address: abc.def@mail.c@
Email address is invalid.
Enter your email address: abc.def@mail.cc
Email address is valid.
Knowledge Organiser
Use these resources as a reference to help you meet the success criteria.
Programming guide:
Flowcharts:
Parsons:
Evaluate
Run the unit tests below to check that your program has met the success criteria.
Enter your email address: name@domain.com
Email address is valid.
Enter your email address: n!me@domain.com
Email address is invalid.
Enter your email address: namedomain
Email address is invalid.
Enter your email address: name-123@domain
Email address is valid.
Enter your email address: name--123@domain
Email address is invalid.
Enter your email address: name@dom
Email address is valid.
Enter your email address: name@do
Email address is invalid.
Enter your email address: name@domain-123.com
Email address is valid.
Check that you have:
- Used comments within the code to describe the purpose of subprograms, conditions and iterations.
- Used meaningful identifier names. That means the names of subprograms and variables indicate what they are for.