Quiz: Regular Expressions

10?試題

1.?

Which of the following best describes "Regular Expressions"?

A way to solve Algebra formulas for the unknown value

A way to calculate mathematical values paying attention to operator precedence

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

A small programming language unto itself

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]

3.?

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

Match anything but a lowercase letter or digit

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

Match any text that is surrounded by square braces

Match a lowercase letter or a digit

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

4.?

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

A boolean

A single character

A list of strings

An integer

A string

5.?

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

$

+

.

*

?

^

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"

7.?

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

Several digits followed by a plus sign

Any number of digits at the beginning of a line

One or more digits

Zero or more digits

Any mathematical expression

8.?

What does the following Python sequence print out?

x = 'From: Using the : character' y = re.findall('^F.+:', x) print y

:

From:

^F.+:

['From: Using the :']

['From:']

9.?

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

^

?

**

\g

$

++

10.?

Given the following line of text:

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

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

stephen.marquard@uct.ac.za

d@u

\@\

From

marquard@uct

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