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Fun, engaging games to boost memory, math fluency, typing speed, and English skillsβperfect for learners of all ages.
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Knowledge
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does the regex β represent?
π‘ Hint: Think about what constitutes an empty language.
Question 2
Easy
What is symbol Ο΅ used for in regex?
π‘ Hint: Consider how it defines a match for zero 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 empty set (β ) represent?
- A language with no strings
- A language containing the empty string
- A single character
π‘ Hint: Think of what matches would result in nothing.
Question 2
True or False: The symbol Ο΅ represents the empty string.
- True
- False
π‘ Hint: Reflect on what an empty match refers to.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a regex pattern that matches the string 'Hello' or nothing.
π‘ Hint: Consider how you could express 'or nothing' in regex.
Challenge and get performance evaluation