Regex literal syntax (/pattern/) in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a regex that matches the word 'cat'.

Ruby

pattern = /[1]/

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

Acat

Bdog

Cbat

Drat

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different word inside the slashes.

Forgetting the slashes around the pattern.

The regex literal /cat/ matches the exact string 'cat'.

2fill in blank

medium

Complete the code to check if the string 'hello' contains the letter 'e'.

Ruby

if 'hello' =~ /[1]/
  puts 'Found e'
end

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

Aa

Bo

Ci

De

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a letter not present in the string.

Using quotes inside the regex slashes.

The regex /e/ matches the letter 'e' in the string 'hello'.

3fill in blank

hard

Fix the error in the regex literal to match any digit.

Ruby

pattern = /[1]/

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

A[d]

Bd

C\d

D(d)

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'd' without backslash matches the letter 'd', not digits.

Using square brackets or parentheses incorrectly.

The regex /\d/ matches any digit character. The backslash must be escaped in Ruby regex literals.

4fill in blank

hard

Fill both blanks to create a regex that matches a word starting with 'a' and ending with 'z'.

Ruby

pattern = /[1].*[2]/

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

A^a

Ba

Cz$

D$z

Attempts:

3 left

💡 Hint

Common Mistakes

Placing anchors in the wrong order.

Using '$z' instead of 'z$'.

The regex /^a.*z$/ matches strings starting with 'a' and ending with 'z'.

5fill in blank

hard

Fill all three blanks to create a regex that matches a string with exactly three digits.

Ruby

pattern = /^[1][2][3]$/

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

A\d

B[0-9]

C\w

D\s

Attempts:

3 left

💡 Hint

Common Mistakes

Using \w which matches letters and digits.

Using \s which matches whitespace.

The regex /^\d\d\d$/ matches exactly three digits from start to end.