What is the output of the following code:
import re
result = re.sub(r's', '-', 'This is a test.')
print(result)

What is a regular expression in Python?

A. A sequence of characters that defines a search pattern

B. A built-in function

C. A mathematical expression

D. A special data type

What is the purpose of the re.compile() function in Python?

A. It compiles a regular expression pattern into a regular expression object

B. It converts strings to regular expressions

C. It defines a new class

D. It imports the re module

Which module in Python supports regular expressions?

A. re

B. regex

C. pyregex

D. none of the mentioned

How can you use regular expressions in Python?

A. By using the re module

B. By using the regex keyword

C. By including it as a string

D. By using the regx function