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Assignment 2: Java Regular Expressions
ECE 325 OBJECT-ORIENTED SOFWARE
DES (LEC A1 Fa18)
Assignment 2: Java Regular Expressions
·Source code: CookieTest.java
· A working copy of your solution
must be submitted to eClass before this date.
Valid or invalid that is the question?
Web applications have several challenges; perhaps the most serious being the difficultly
in maintaining state information. A common solution to this issue is to use cookies as a
mechanism to encode and distribute this information. However, as the cookie passes
from a server to a client and back neither side can assume that the cookie is valid.
You are required to produce a Java program, which uses the regular expression to
answer the question: “Is this cookie (supplied as an input) valid or not?”
For this assignment, a valid cookie is defined by these subset of rules found in RFC 6265
(HTTP State Management Mechanism), along with RFC 2616, RFC 1123, and RFC 1034.
Note that only the rules in this assignment have to be implemented. A fully functional
cookie checker is not required.
Assignment https://eclass.srv.ualberta.ca/mod/assign/view.php?id…
1 of 5 2018-09-19, 11:34 a.m.
set-cookie-header = “Set-Cookie:” SP set-cookie-string
set-cookie-string = cookie-pair *( “;” SP cookie-av )
cookie-pair = cookie-name “=” cookie-value
cookie-name = token
token = 1*<any CHAR except CTLs or separators
separators = “(” | “)” | “<” | “” | “@”
| “,” | “;” | “:” | “\” | <”
| “/” | “[” | “]” | “?” | “=”
| “{” | “}” | SP | HT
cookie-value = *cookie-octet / ( DQUOTE *cookie-octet DQUOTE )
cookie-octet = %x21 / %x23-2B / %x2D-3A / %x3C-5B / %x5D-7E
; US-ASCII characters excluding CTLs,
; whitespace DQUOTE, comma, semicolon,
; and backslash
cookie-av = expires-av / max-age-av / domain-av /
path-av / secure-av / httponly-av
expires-av = “Expires=” rfc1123-date
rfc1123-date = wkday “,” SP date1 SP time SP “GMT”
date1 = 2DIGIT SP month SP 4DIGIT
; day month year (e.g., 02 Jun 1982)
time = 2DIGIT “:” 2DIGIT “:” 2DIGIT
; 00:00:00 – 23:59:59
wkday = “Mon” | “Tue” | “Wed”
| “Thu” | “Fri” | “Sat” | “Sun”
month = “Jan” | “Feb” | “Mar” | “Apr”
| “May” | “Jun” | “Jul” | “Aug”
| “Sep” | “Oct” | “Nov” | “Dec”
max-age-av = “Max-Age=” non-zero-digit *DIGIT
non-zero-digit = %x31-39
; digits 1 through 9
domain-av = “Domain=” domain-value
domain-value = <domain
path-av = “Path=” path-value
path-value = <any CHAR except CTLs or “;”
secure-av = “Secure”
httponly-av = “HttpOnly”
<domain ::= <subdomain | ” ”
<subdomain ::= <label | <subdomain “.” <label
<label ::= <letter [ [ <ldh-str ] <let-dig ]
<ldh-str ::= <let-dig-hyp | <let-dig-hyp <ldh-str
<let-dig-hyp ::= <let-dig | “-”
<let-dig ::= <letter | <digit
<letter ::= any one of the 52 alphabetic characters A through Z in upper case and a through z in lower case
<digit ::= any one of the ten digits 0 through 9
Assignment https://eclass.srv.ualberta.ca/mod/assign/view.php?id…
2 of 5 2018-09-19, 11:34 a.m.
Hint: to understand the definition, you may need Augmented Backus-Naur Form.
Examples/Testcases
Here are the examples of cookies (test cases, both valid and invalid) to assist you in constructing such a progr
HTTP/1.x 200 OK
Server: Apache-Coyote/1.1
1. Set-Cookie: ns1=”alss/0.foobar^” # name=value
2. Set-Cookie: ns1= # empty value
3. Set-Cookie: ns1=; Expires=Wed, 19 Nov 2008 16:35:39 GMT # Expires=time_stamp
4. Set-Cookie: ns1=; Domain= # empty Domain
5. Set-Cookie: ns1=; Domain=.srv.a.com-0 # Domain=host_name
6. Set-Cookie: lu=Rg3v; Expires=Wed, 19 Nov 2008 16:35:39 GMT; Path=/; Domain=.example.com; HttpOnly
7. Set-Cookie: # empty cookie-pair
8. Set-Cookie: sd # no “=”
9. Set-Cookie: =alss/0.foobar^ # empty name
10. Set-Cookie: [email protected]=alss/0.foobar^ # illegal name
11. Set-Cookie: ns1=alss/0.foobar^; # trailing “;”
12. Set-Cookie: ns1=; Expires=Wed 19 Nov 2008 16:35:39 GMT # illegal Expires value
13. Set-Cookie: ns1=alss/0.foobar^; Max-Age=01 # illegal Max-Age: starting 0
14. Set-Cookie: ns1=alss/0.foobar^; Domain=.0com # illegal Domain: starting 0
15. Set-Cookie: ns1=alss/0.foobar^; Domain=.com- # trailing non-letter-digit Domain
16. Set-Cookie: ns1=alss/0.foobar^; Path= # empty Path
17. Set-Cookie: ns1=alss/0.foobar^; httponly # lower case of “HttpOnly”
Cache-Control: private
Pragma: no-cache
Content-Encoding: gzip
Content-Type: text/html;charset=UTF-8
Content-Length: 22784
Date: Tue, 18 Nov 2008 16:35:39 GMT
CookieTest.java 
Submission status
Attempt number This is attempt 1 ( 1 attempts allowed ).
Submission status No attempt
Grading status Not graded
Due date Thursday, 27 September 2018, 5:00 PM
Assignment https://eclass.srv.ualberta.ca/mod/assign/view.php?id…
3 of 5 2018-09-19, 11:34 a.m.
Time remaining 8 days 5 hours
Last modified –
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Assignment https://eclass.srv.ualberta.ca/mod/assign/view.php?id…
4 of 5 2018-09-19, 11:34 a.m.
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ECE 325 (LEC A1 Fa18)
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Assignment https://eclass.srv.ualberta.ca/mod/assign/view.php?id…
5 of 5 2018-09-19, 11:34 a.m.

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