Practice - Recursive Steps (Operations on Regular Expressions)
Practice Questions
Test your understanding with targeted questions
What does the regular expression ∅ represent?
💡 Hint: Consider what it means to have no options.
Explain what the empty string ϵ represents.
💡 Hint: Think about a string with no characters.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What does the union operation in regular expressions do?
💡 Hint: Think about when one or the other is valid.
Is the expression a* an example of Kleene star?
💡 Hint: Consider how many times 'a' can occur.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Create a regular expression that matches any string starting with 'A' and followed by zero or more 'a's.
💡 Hint: Focus on how to represent the starting character and repetitions afterward.
Given the expressions R1 = 'cat' and R2 = 'dog', what does the expression (R1 + R2)* represent?
💡 Hint: Think about what it means to repeat those groups together.
Get performance evaluation
Reference links
Supplementary resources to enhance your learning experience.