DACS3203 Lab08-Input Valida7on
Task 1
Please write your answers for the questions below using a different color or highlighting for ease
of grading.
1. Run the code given above and test it with the email addresses given below. If any of them is
invalid, explain why?
Salem.salam@udst.com valid
ahmad-hamada@example.com valid
khaled-._khaldi@sales.comp-any.academy invalid
hamed.hameed@sub-domain.my_company.com invalid
jameel/jamal@-company.com invalid
• Makes sure username (before @) contains letters, numbers, underscores, hyphens, or
dots.
• Domain name (following @) contains letters, numbers, underscores, or hyphens.
• Top-Level Domain (TLD) must be 2 to 4 characters.
2. Although most top-level domains are usually 2-3 characters long, the maximum length of a
TLD nowadays is 63 characters. Change the regular expression used in the code to validate the
email address to accept such length. Write the new regex below after testing it.
• This allows TLDs of a maximum of 63 characters
3. Change the regex used in the code so that it doesn't match email addresses with subdomains.
For example, user@subdomain.domain.tld should not be a valid email address. Write the new
regex below after testing it.
• This ensures there’s only one dot (.) in the domain.
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4. Create a method in the code that asks the user to enter a username and uses a regex to validate
it. The username cannot contain a space, but it may contain only lowercase letters, a hyphen,
and an underscore. The minimum length is 2 characters, and the maximum is 10 characters.
Add your regex below after testing it in the code.
• Allowed: a-z, -, _
• Length:2to10characters
• No spaces allowed
5. Credit card numbers have 16 digits, every four digits must be separated by either a hyphen or
a space (e.g. 4444-5555-6666-7777 or 4444 5555 6666 7777). However, a credit card number
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DACS3203 Lab08-Input Valida7on
that has a mixture of separators is invalid (e.g. 4444-5555 6666 7777). Create a method that
asks the user to input a credit card number and uses a regex to validate it. Add your regex
below after testing it in the code.
• 16digits
• Grouped in 4 groups of 4 digits.
• Allowed separators: Hyphen(-)or space().
• Mixing separators is NOT allowed.
6. Qatari phone numbers can be written using one of the following international formats:
+974nnnnnnnn
00974nnnnnnnn
(974)nnnnnnnn
Create a method that asks the user to input a Qatari phone number and uses a regex to validate
it. Add your regex below after testing it in the code.
• Valid Formats:
o +974nnnnnnnn
o 00974nnnnnnnn
o (974)nnnnnnnn
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7. Create a method that asks the user to input a date and validate it. The date can be entered in
one of the following formats only:
dd-mm-yyyy
dd/mm/yyyy
dd-mm-yy
dd/mm/yy
Add your regex below after testing it in the code.
• Valid Formats:
o dd-mm-yyyy
o dd/mm/yyyy
o dd-mm-yy
o dd/mm/yy
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DACS3203 Lab08-Input Valida7on
8. Create a method that asks the user to input a string. Use a regex to validate the string so that it
will be invalid if it contains any of the tags <script> or </script>. Add your regex below after
testing it in the code.
• To prevent XSS attacks, block:
a. Case-Insensitive (Blocks <script> and <SCRIPT>).
b. Prevents XSS attacks.
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Submission
1. Submit this document after adding your answers and your modified java source code file. Do
not zip the files.
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