Gsub with regex in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to replace all digits with '#' in the string.

Ruby

text = "Phone: [phone]"
result = text.gsub([1], '#')
puts result

Drag options to blanks, or click blank then click option'

A"\d"

B/\d/

C/d/

D"d"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a regex pattern.

Using incorrect regex syntax like /d/ which matches letter 'd'.

The regex /\d/ matches any digit character. Using it with gsub replaces all digits.

2fill in blank

medium

Complete the code to replace all vowels with '*'.

Ruby

sentence = "Hello World"
new_sentence = sentence.gsub([1], '*')
puts new_sentence

Drag options to blanks, or click blank then click option'

A/[AEIOU]/

B"[aeiou]"

C/[aeiou]/

D/aeiou/

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of regex.

Not including brackets [] to form a character set.

The regex /[aeiou]/ matches any lowercase vowel. It replaces all vowels with '*'.

3fill in blank

hard

Fix the error in the code to replace all whitespace with underscores.

Ruby

text = "Ruby is fun"
fixed_text = text.gsub([1], '_')
puts fixed_text

Drag options to blanks, or click blank then click option'

A/\s+/

B"\s"

C/\s/

D"\s+"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of regex.

Not using + to match multiple spaces.

The regex /\s+/ matches one or more whitespace characters, replacing them with underscores.

4fill in blank

hard

Fill both blanks to replace all digits with 'X' only if digit is greater than 5.

Ruby

numbers = "1234567890"
result = numbers.gsub([1]) { |digit| digit.to_i [2] 5 ? 'X' : digit }
puts result

Drag options to blanks, or click blank then click option'

A/\d/

B>

C<

D/[0-9]/

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect regex or string instead of regex.

Using wrong comparison operator.

The regex /\d/ matches digits. The condition digit.to_i > 5 replaces digits greater than 5 with 'X'.

5fill in blank

hard

Fill all three blanks to replace all words starting with 'a' or 'A' with 'word'.

Ruby

text = "An apple a day keeps the doctor away"
new_text = text.gsub([1]) { |w| w.downcase.start_with?([2]) ? [3] : w }
puts new_text

Drag options to blanks, or click blank then click option'

A/\b\w+\b/

B"a"

C"word"

D"A"

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect regex that doesn't match words.

Checking for uppercase 'A' only.

Not replacing with the correct string.

The regex /\b\w+\b/ matches words. Checking if word starts with 'a' replaces it with 'word'.