Scan for all matches in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find all words starting with 'a' in the string.

Ruby

text = "apple banana apricot cherry"
matches = text.scan([1])
puts matches

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

A/\ba\w*/

B/a/

C/^a/

D/a+/

Attempts:

3 left

💡 Hint

Common Mistakes

Using /a/ matches all 'a' characters, not whole words.

Using /^a/ matches only if 'a' is at the start of the string.

The regex /\ba\w*/ matches words starting with 'a'. The \b ensures word boundary.

2fill in blank

medium

Complete the code to find all numbers in the string.

Ruby

text = "There are 12 apples and 30 bananas."
numbers = text.scan([1])
puts numbers

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

A/\w+/

B/[a-z]+/

C/\d+/

D/\s+/

Attempts:

3 left

💡 Hint

Common Mistakes

Using /[a-z]+/ matches letters, not numbers.

Using /\s+/ matches spaces, not numbers.

The regex /\d+/ matches one or more digits, capturing all numbers.

3fill in blank

hard

Fix the error in the code to find all words ending with 'ing'.

Ruby

text = "I am singing and dancing"
matches = text.scan([1])
puts matches

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

A/\w+ing\b/

B/\bing/

C/ing$/

D/ing\b/

Attempts:

3 left

💡 Hint

Common Mistakes

Using /ing$/ matches only if 'ing' is at the end of the string.

Using /\bing/ matches words starting with 'ing', not ending.

The regex /\w+ing\b/ matches whole words ending with 'ing'.

4fill in blank

hard

Fill both blanks to find all words with exactly 4 letters.

Ruby

text = "This code finds four letter words like test and code"
matches = text.scan([1]).select { |word| word.length [2] 4 }
puts matches

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

A/\b\w+\b/

B==

C>=

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using >= or <= selects words longer or shorter than 4, not exactly 4.

Use /\b\w+\b/ to find words, then select those with length == 4.

5fill in blank

hard

Fill all three blanks to find all words starting with a vowel and longer than 3 letters.

Ruby

text = "apple orange banana egg umbrella cat dog"
matches = text.scan([1]).select { |word| word.length [2] 3 && word[0].downcase [3] /[aeiou]/ }
puts matches

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

A/\b\w+\b/

B>

C=~

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of =~ for regex match.

Using >= instead of > for length check.

Use /\b\w+\b/ to find words, select those longer than 3 and starting with a vowel using =~.