Python - Using Python to Access Web Data - Regular Expression - Quiz

Question 1

1
point

1. Question 1

Which of the following best describes "Regular Expressions"?

A way to solve Algebra formulas for the unknown value

The way Python handles and recovers from errors that would otherwise cause a traceback

A way to calculate mathematical values paying attention to operator precedence

A small programming language unto itself

Question 2

1
point

2. Question 2

Which of the following is the way we match the "start of a line" in a regular expression?

^

str.startswith()

\linestart

String.startsWith()

variable[0:1]

Question 3

1
point

3. Question 3

What would the following mean in a regular expression? [a-z0-9]

Match any number of lowercase letters followed by any number of digits

Match anything but a lowercase letter or digit

Match any text that is surrounded by square braces

Match a lowercase letter or a digit

Match an entire line as long as it is lowercase letters or digits

Question 4

1
point

4. Question 4

What is the type of the return value of the re.findall() method?

A string

A list of strings

A single character

A boolean

An integer

Question 5

1
point

5. Question 5

What is the "wild card" character in a regular expression (i.e., the character that matches any character)?

^

$

+

*

.

?

Question 6

1
point

6. Question 6

What is the difference between the "+" and "*" character in regular expressions?

The "+" matches at least one character and the "*" matches zero or more characters

The "+" matches upper case characters and the "*" matches lowercase characters

The "+" matches the beginning of a line and the "*" matches the end of a line

The "+" matches the actual plus character and the "*" matches any character

The "+" indicates "start of extraction" and the "*" indicates the "end of extraction"

Question 7

1
point

7. Question 7

What does the "[0-9]+" match in a regular expression?

One or more digits

Any mathematical expression

Zero or more digits

Several digits followed by a plus sign

Any number of digits at the beginning of a line

Question 8

1
point

8. Question 8

What does the following Python sequence print out?

1

2

3







x = 'From: Using the : character'



y = re.findall('^F.+:', x)



print(y)

From:

:

['From:']

['From: Using the :']

^F.+:

Question 9

1
point

9. Question 9

What character do you add to the "+" or "*" to indicate that the match is to be done in a non-greedy manner?

?

$

\g

**

^

++

Question 10

1
point

10. Question 10

Given the following line of text:

1







From stephen.marquard@uct.ac.za Sat Jan  5 09:14:16 2008

What would the regular expression '\S+?@\S+' match?

From

\@\

marquard@uct

stephen.marquard@uct.ac.za

d@u