Common patterns and character classes in Ruby - Mini Project: Build & Apply

Common patterns and character classes

📖 Scenario: You are working on a simple text processing tool that needs to find specific patterns in a string. This is useful for searching and validating text like phone numbers, emails, or codes.

🎯 Goal: Build a Ruby program that uses regular expressions with common patterns and character classes to find all vowels in a given string.

📋 What You'll Learn

Create a string variable with a specific sentence.

Create a regular expression pattern using character classes to match vowels.

Use the pattern to find all vowels in the string.

Print the list of vowels found.

💡 Why This Matters

🌍 Real World

Finding patterns like vowels, digits, or specific characters is common in text processing, data validation, and search features.

💼 Career

Understanding regular expressions and character classes is essential for roles in software development, data analysis, and quality assurance.

1

Create the text string

Create a string variable called text and set it to the exact value "Hello, Ruby learners!".

Ruby

# Create a string variable called text with the value "Hello, Ruby learners!"
# Your code here

Need a hint?

Use double quotes to create the string exactly as shown.

2

Create a vowel pattern

Create a regular expression variable called vowel_pattern that matches any vowel character (a, e, i, o, u) using a character class. Use the pattern /[aeiou]/i to match vowels case-insensitively.

Ruby

text = "Hello, Ruby learners!"
# Create a regular expression vowel_pattern to match vowels (a, e, i, o, u) case-insensitively
# Your code here

Need a hint?

Use square brackets [] to create a character class and add i after the slash for case-insensitive matching.

3

Find all vowels in the text

Use the scan method on text with vowel_pattern to find all vowels. Store the result in a variable called vowels.

Ruby

text = "Hello, Ruby learners!"
vowel_pattern = /[aeiou]/i
# Use scan method on text with vowel_pattern and store in vowels
# Your code here

Need a hint?

The scan method returns all matches as an array.

4

Print the vowels found

Print the vowels array using puts vowels.inspect to show all vowels found in the text.

Ruby

text = "Hello, Ruby learners!"
vowel_pattern = /[aeiou]/i
vowels = text.scan(vowel_pattern)
# Print the vowels array
# Your code here

Need a hint?

Use puts vowels.inspect to print the array in a readable format.