Can any one solve these problems?Note: Please note that most questions only require a single (one line) “Regular Expression”. Questions which ask for a “complete program” should only require a few lines; nothing longer (or significantly different)
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Please note that most questions only require a single (one line) “Regular Expression”. Questions
which ask for a “complete program” should only require a few lines; nothing longer (or
significantly different)
External resources are to be used for reference purposes only; blatant copying of solutions found
on-line (or from other students) could result in receiving a zero.

Unless otherwise specified for the Regular Expression questions, you can assume that the expression is
being applied to some arbitrary text file where the contents is not known in advance.

Unless the question states that you should write a complete program, you should only write the expression
and NOT a complete program.

All references to “Perl Style” regular expressions simply means that the expression should be written in the
form: m/match_pattern/ or s/match_pattern/substitution_pattern/
(depending on whichever is appropriate).
Note: Much of the text has been “locked” in this document, not as a “security measure”, but to prevent accidental
editing or deletion of questions. The area beneath each question should be freely editable and feel free to add to
remove space between questions as you need!
1. All three of the languages we studied over the course of the semester (JavaScript, Python, and a little
Perl) each have Regular Expression processing capabilities either “built-in” to the core syntax of the
language or have Regular expression processing available as a standard/supplied library which can be
imported.
a)
(2 pts)
Which language(s) have regular expression evaluation integrated into the syntax of the
language.
b)
(2 pts)
Which language(s) require the import of additional “regular expression” library, before
regular expression searching/matching/substitution can be use.
For the following questions, which you have write a regular expression, ONLY the expression and
nothing but the expression is needed. Complete “functions” are not necessary, nor should they be
included as part of the answer. For convenience you may assume that any “new-line” makers are
never “consumed” as part of a match and the can be safely ignored.
Pattern Matching
2.
(2 pts)
Show a regular expression that will match any a string of characters which contains any
number of occurrences of the letter A (and only the letter A, with no other characters or spaces).
(EXAMPLE STRING: AAAAA).
3.
(2 pts)
4.
(2 pts)
Show a regular expression that will match any a string of characters which contains at least on
occurrence of the letter A, if it is not either the first character or the last character of the string:
(EXAMPLE STRING: BCDABC)
Show a regular expression would match only a line with exactly 100 character?
5.
(2 pts)
Show a regular expression would match all words in a string that begin and end with the
same letter? (EXAMPLE STRING: “algebra” matches but “amoebae” does not.)
6.
(2 pts)
Write a “Perl style” regular expression which would match any line containing adjacent
repeated words. For example:
this is is a line (would match against the expression.)
this is a line
(would NOT match against the expression.)
Substitutions
7.
(2 pts)
A file consists of nothing but a series of value pairs in the following form
username=userid, where username can be any combination of letters and numbers and
userid is and any numerical value. Write a “Perl style” regular expression which will swap the
username and userid values, so username=userid becomes userid=username.
|
(EXAMPLE: abcd1=1234 would become 1234=abcd1)
8.
(2 pts)
Write a “Perl style” regular expression that would search/replace all occurrences of 10
consecutive digits in a string (only 10, no more no less; e.g., 1234567890) in a string with the exact
same digits in the following format: 123-456-7890
For Example:
Search String:
Becomes:
Here are some numbers 123456780 which match.
Here are some numbers 123-456-7890 which match.
Search String:
Stays:
Here are some numbers 1234454956780 which do not match.
Here are some numbers 1234454956780 which do not match.
9.
Using regular expressions, write a complete Perl script that, when given input from a file as
shown in the sample as shown below, displays ONLY the valid phone numbers found anywhere in
the file. For this example, assume a phone number is valid only if it is in the following – rather
unusual – form (where 9 represents any number): [999]-999-9999
(5 pts)
Sample Input:
this is a test
12345676867
[123]-456-7890
My number: [123]-555-1212
Not a phone number: [123]-5555-1212
test 9999 test.
A phone number ([123]-999-0000) exists on this line.
There is no phone number ({123]-999+0000) on this line.
Sample Output:
[123]-456-7890
[123]-555-1212
[123]-999-0000
Alice Adventures in Wonderland.
For each of the following, use the alice.txt file which is attached to this “Assignment” in Blackboard.
Though you must use “Regular Expressions” in some manner to arrive at the solution, you may use
either Perl or Python for the “code portion” of the answer.
Show the regular expression (or complete code where applicable) to determine each of the following:
10.
(2 pts)
Show all of the words with 15 or more letters in the word.
11.
(2 pts)
Show the count of the number of occurrences of the word “Alice” in the file.
12.
(2 pts)
Show the line of the file containing the greatest number of occurrences of the word “Alice”.
13.
(2 pts)
List/show all of the URL’s (http: or https:) in the file.
14.
(2 pts)
15.
(2 pts)
Eliminate/remove/exclude all lines containing only asterisks from the file.
List/show all the phrases that appear between single quotes. Note that apostrophes and single
quotes use the same character (‘)

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