Coursera | Using Python to Access Web Data

Regular Expressions >> Using Python to Access Web Data

Regular Expressions >> Using Python to Access Web Data


1. Which of the following best describes “Regular Expressions”?

  • 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
  • A way to solve Algebra formulas for the unknown value

2. What will the ‘$’ regular expression match?

  • The end of a line
  • A new line at the end of a line
  • The beginning of a line
  • A dollar sign
  • An empty line

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 any number of lowercase letters followed by any number of digits
  • Match a lowercase letter or a digit

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

  • A single character
  • A list of strings
  • A boolean
  • A string
  • An integer

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?

  • One or more digits
  • Zero or more digits
  • Several digits followed by a plus sign
  • Any number of digits at the beginning of a line
  • 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:’]
  • :
  • From:
  • ^F.+:
  • [‘From: Using the :’]

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:

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


What would the regular expression ‘[email protected]+’ match?

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