Why regex is powerful in Ruby - See It in Action

Why regex is powerful in Ruby

📖 Scenario: You are working on a simple text processing task where you need to find and extract specific patterns from a string. Ruby's regular expressions (regex) make this easy and powerful.

🎯 Goal: Learn how to use Ruby regex to find all words that start with a capital letter in a sentence.

📋 What You'll Learn

Create a string variable with a sentence containing several words, some starting with capital letters

Create a regex pattern to match words starting with a capital letter

Use Ruby's regex methods to find all matching words

Print the list of matched words

💡 Why This Matters

🌍 Real World

Regex is used in many real-world tasks like searching text, validating input, and extracting data from documents.

💼 Career

Knowing regex in Ruby is valuable for jobs in web development, data processing, and automation where text handling is common.

1

Create the sentence string

Create a string variable called sentence and set it to the exact value: "Ruby is Powerful and Easy to Learn"

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 the regex pattern

Create a regex variable called capital_word_pattern that matches words starting with a capital letter. Use the pattern /\b[A-Z][a-z]*\b/

Ruby

sentence = "Ruby is Powerful and Easy to Learn"
# Create the regex variable 'capital_word_pattern' with the pattern /\b[A-Z][a-z]*\b/
# Your code here

Need a hint?

The pattern matches word boundaries, a capital letter, then zero or more lowercase letters.

3

Find all matching words

Use the scan method on sentence with capital_word_pattern to find all words starting with a capital letter. Store the result in a variable called capital_words

Ruby

sentence = "Ruby is Powerful and Easy to Learn"
capital_word_pattern = /\b[A-Z][a-z]*\b/
# Use scan method to find all capitalized words and store in 'capital_words'
# Your code here

Need a hint?

The scan method returns an array of all matches.

4

Print the matched words

Print the variable capital_words to display the list of words starting with a capital letter

Ruby

sentence = "Ruby is Powerful and Easy to Learn"
capital_word_pattern = /\b[A-Z][a-z]*\b/
capital_words = sentence.scan(capital_word_pattern)
# Print the 'capital_words' array
# Your code here

Need a hint?

Use puts to print the array. Each word will appear on its own line.