Practice Regular Expressions (re) To Represent Tokens: Defining The Patterns (2.3)
Students

Academic Programs

AI-powered learning for grades 8-12, aligned with major curricula

Engineering Courses
Professional

Professional Courses

Industry-relevant training in Business, Technology, and Design

Certifications
Games

Interactive Games

Fun games to boost memory, math, typing, and English skills

Regular Expressions (RE) to Represent Tokens: Defining the Patterns

Practice - Regular Expressions (RE) to Represent Tokens: Defining the Patterns

Learning

Practice Questions

Test your understanding with targeted questions

Question 1 Easy

What does the regex ^[A-Za-z_][A-Za-z0-9_]* represent?

💡 Hint: Think about what defines a variable name.

Question 2 Easy

Write a regex for matching any digit.

💡 Hint: Consider what constitutes a single digit in numbers.

4 more questions available

Interactive Quizzes

Quick quizzes to reinforce your learning

Question 1

What does the Kleene star operator do in regular expressions?

Matches one or more occurrences
Matches zero or more occurrences
Does not match any occurrences

💡 Hint: Remember its definition and usage in matching patterns.

Question 2

True or False: Regular expressions can define complex nested structures.

True
False

💡 Hint: Think about the limitations of regex.

1 more question available

Challenge Problems

Push your limits with advanced challenges

Challenge 1 Hard

Create a regex that matches valid C++ identifiers and explain why it works.

💡 Hint: Think about rules for variable naming conventions.

Challenge 2 Hard

Develop a regex pattern to match dates in the format DD/MM/YYYY.

💡 Hint: Consider the ranges of valid days and months.

Get performance evaluation

Reference links

Supplementary resources to enhance your learning experience.