Practice Regular Expressions - 3.8 | Module 3: Non-Deterministic Finite Automata (NFA) and Regular Expressions | Theory of Computation
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3.8 - Regular Expressions

Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What does the regular expression 'a*' match?

💡 Hint: Think about how many 'a's can be present including none.

Question 2

Easy

What does the union operation in regular expressions indicate?

💡 Hint: Remember the word 'or'!

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 '(cat|dog)' match?

  • Only 'cat'
  • Only 'dog'
  • Either 'cat' or 'dog'

💡 Hint: Consider what it means to have an alternate expression.

Question 2

True or False: The expression 'a*' must always match at least one character.

  • True
  • False

💡 Hint: Think about the meaning of '*' in regex.

Solve and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Create a regex that matches any string containing at least one digit.

💡 Hint: Consider how to represent a digit.

Question 2

Develop a regex to match a date format 'YYYY-MM-DD'.

💡 Hint: Think about how you would describe each part of the date.

Challenge and get performance evaluation