Gsub with regex in Ruby - Mini Project: Build & Apply

Gsub with regex

📖 Scenario: You are working on a text editor feature that needs to clean up user input by replacing certain patterns in a string.

🎯 Goal: Learn how to use Ruby's gsub method with regular expressions to find and replace parts of a text.

📋 What You'll Learn

Create a string variable with a specific sentence.

Create a regular expression pattern to find all vowels.

Use gsub with the regex to replace vowels with a star *.

Print the modified string.

💡 Why This Matters

🌍 Real World

Text editors and input sanitizers often need to find and replace patterns in text, like removing vowels or masking sensitive data.

💼 Career

Understanding how to use regular expressions with string replacement is a valuable skill for software developers working on data cleaning, text processing, and user input validation.

1

Create the initial string

Create a string variable called sentence and set it to the exact value "Hello World! Welcome to Ruby programming."

Ruby

# Create the string variable 'sentence' with the given text
# Your code here

Need a hint?

Use double quotes to create the string exactly as shown.

2

Create a regex pattern for vowels

Create a variable called vowels_regex and set it to a regular expression that matches all vowels (both uppercase and lowercase). Use /[aeiouAEIOU]/ as the pattern.

Ruby

sentence = "Hello World! Welcome to Ruby programming."
# Create the regex variable 'vowels_regex' to match vowels
# Your code here

Need a hint?

Use slashes /.../ to create the regex pattern.

3

Replace vowels with stars using gsub

Use the gsub method on sentence with vowels_regex to replace all vowels with the star character '*'. Store the result in a new variable called cleaned_sentence.

Ruby

sentence = "Hello World! Welcome to Ruby programming."
vowels_regex = /[aeiouAEIOU]/
# Use gsub with vowels_regex to replace vowels with '*'
# Store the result in 'cleaned_sentence'
# Your code here

Need a hint?

Call gsub on sentence with vowels_regex and '*' as arguments.

4

Print the cleaned sentence

Print the variable cleaned_sentence to display the sentence with vowels replaced by stars.

Ruby

sentence = "Hello World! Welcome to Ruby programming."
vowels_regex = /[aeiouAEIOU]/
cleaned_sentence = sentence.gsub(vowels_regex, '*')
# Print the cleaned_sentence
# Your code here

Need a hint?

Use puts cleaned_sentence to print the result.