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Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skillsβperfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does the regular expression β represent?
π‘ Hint: Consider what it means to have no options.
Question 2
Easy
Explain what the empty string Ο΅ represents.
π‘ Hint: Think about a string with no characters.
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 union operation in regular expressions do?
- Combines languages
- Sequentially joins strings
- Represents one choice
π‘ Hint: Think about when one or the other is valid.
Question 2
Is the expression a* an example of Kleene star?
- True
- False
π‘ Hint: Consider how many times 'a' can occur.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a regular expression that matches any string starting with 'A' and followed by zero or more 'a's.
π‘ Hint: Focus on how to represent the starting character and repetitions afterward.
Question 2
Given the expressions R1 = 'cat' and R2 = 'dog', what does the expression (R1 + R2)* represent?
π‘ Hint: Think about what it means to repeat those groups together.
Challenge and get performance evaluation