Exercise 071: Regular Expression Sigil ~r

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Exercise 071: Regular Expression Sigil ~r

Topic: Sigils
Level: 17
Difficulty: 1

Prerequisites

• Exercise 005: Strings
• Basic regex understanding

Learning Objectives

Students will learn to:

• Create regex with ~r sigil
• Use Regex.match? and Regex.run
• Understand regex modifiers

Key Concepts

• ~r sigil syntax
• Regex module functions
• Regex modifiers (i for case-insensitive)

Exercise Structure

• Explain ~r"pattern" creates compiled regex
• Show examples with Regex.match?, Regex.run
• Task: Match string against regex pattern
• Expected output: Boolean match result

Hints

~r allows regex without double-escaping backslashes

References

• Elixir docs: https://hexdocs.pm/elixir/Regex.html