Practice Formal Definition and Syntax (Recursive Construction) - 3.8.1 | Module 3: Non-Deterministic Finite Automata (NFA) and Regular Expressions | Theory of Computation
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Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What does the regular expression βˆ… represent?

πŸ’‘ Hint: Think of it as having no possible options.

Question 2

Easy

Write a regular expression for a single character 'b'.

πŸ’‘ Hint: It's simply the character itself.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What does the expression 'Ο΅' represent?

  • The empty language
  • The empty string
  • A specific character

πŸ’‘ Hint: Think about what the empty string actually includes.

Question 2

True or False: The expression a | b means match either 'a' or 'b'.

  • True
  • False

πŸ’‘ Hint: Consider if 'or' means one of the options.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Construct a regular expression that describes a string containing only the letters a to z, with lengths ranging from 1 to 5 characters.

πŸ’‘ Hint: Consider using ranges to define the permissible characters and lengths.

Question 2

Create a regex to match a valid email format: it must have an alphanumeric username followed by '@', then a domain.

πŸ’‘ Hint: Think about components of emails and their general format.

Challenge and get performance evaluation