Please follow the instruction strictly

Go to your it117/hw directory and create an hw7 directory. Enter this directory and create the file hw7.py.py Copy the following import statement into the script

 import re 

Copy the following function into your hw7.py script

def test_regular_expression(regex, test_string) : pattern = re.compile(r'' + regex ) match = pattern.match(test_string) if match : try : return match.group(1) except : print('Match found but no substring returned') return '' else: print(regex, 'does not match', string) return '' 

Next copy the following string variables into your script

 auth_log_line = 'Mar 16 11:58:13 it20 sshd[12041]: Accepted password for it341 from 65.96.149.57 port 60695 ssh2' apache_log_line = '205.236.184.32 - - [09/Mar/2014:00:03:21 +0000] "GET /wzbc-2014-03-05-14-00.mp3 HTTP/1.1" 200 56810323' 

Now define the variables to return the following

Variable	Should Return	From String	May Use Literals
regex_1	Month name and day number	auth_log_line
regex_2	Hours, minutes, seconds	auth_log_line	:
regex_3	The hostname, e.g. it20	auth_log_line	: sshd
regex_4	The number in square brackets after 'sshd'	auth_log_line	sshd
regex_5	The account name, e.g. it341	auth_log_line	for
regex_6	IP address	auth_log_line	.
regex_7	Port number	auth_log_line	port
regex_8	IP address	apache_log_line	.
regex_9	Date	apache_log_line	/
regex_10	The file requested	apache_log_line	GET

In each regular expression you create, do not use string literals unless I say you can For example you cannot use the regular expression (Mar) to match the month name in auth_log_line. Don't forget that if you want to use a meta-character as a literal, like . you must escape it with a \.

Test Code

Your script must contain the following test code

print('regex_1', regex_1, '\t returned ', test_regular_expression(regex_1, auth_log_line)) print('regex_2', regex_2, '\t returned ', test_regular_expression(regex_2, auth_log_line)) print('regex_3', regex_3, '\t returned ', test_regular_expression(regex_3, auth_log_line)) print('regex_4', regex_4, '\t returned ', test_regular_expression(regex_4, auth_log_line)) print('regex_5', regex_5, '\t returned ', test_regular_expression(regex_5, auth_log_line)) print('regex_6', regex_6, '\t returned ', test_regular_expression(regex_6, auth_log_line)) print('regex_7', regex_7, '\t returned ', test_regular_expression(regex_7, auth_log_line)) print('regex_8', regex_8, '\t returned ', test_regular_expression(regex_8, apache_log_line)) print('regex_9', regex_9, '\t returned ', test_regular_expression(regex_9, apache_log_line)) print('regex_10', regex_10, '\t returned ', test_regular_expression(regex_10, apache_log_line)) 

Make sure the script obeys all the rules in the Script Requirements page.

Output

I cannot show you the correct output, since that would include the regular expressions that you are required to create for this assignment, but I can show you what the returned values should be

Mar 16 11:58:13 it20 12041 it341 65.96.149.57 60695 205.236.184.32 09/Mar/2014 /wzbc-2014-03-05-14-00.mp3