Free
Course

Learn the Basics of Regular Expressions

Get a taste of regular expressions (regex), a powerful search pattern language to quickly find the text you’re looking for.

4.66 out of 5 stars
28,775 learners enrolled
  • Skill level

    Beginner
  • Time to complete

    Average based on combined completion rates — individual pacing in lessons, projects, and quizzes may vary
    1 hour
  • Certificate of completion

    Included with paid plans
  • Prerequisites

    None

About this course

Regular expressions, or regex for short, are one of the most powerful and applicable techniques in programming. We can use regular expressions to search for and find patterns in strings. They can be used in nearly every language, and they allow us to validate user input, perform search tasks, and even test code. Learn the rules of regular expressions so that you can apply them in any language of your choosing.

Syllabus

The platform

Hands-on learning

Animated GIF of an AI learning assistant explaining an error within Codecademy's learning environment
Mobile-friendly version of a lesson and code editor for the course 'Introduction to HTML' running in Codecademy's learning environment
An AI-generated hint within the instructions of a Codecademy project
Animated GIF of a mouse cursor hovering over the Python term "comment" displaying a Docs tooltip within a Codecademy lesson
Meet the creator of the course
Alisha Grama
Senior Instructional Designer, Computer Science at Codecademy
Alisha is a Senior Instructional Designer in the computer science domain at Codecademy. Alisha majored in Computer Science and minored in Ethics at the University of Rochester, where she gained experience as a Teaching Assistant. Before joining Codecademy, she taught STEM concepts to secondary students, including as the Lead Algebra Teacher at a Brooklyn charter school.

Learn the Basics of Regular Expressions course ratings and reviews

4.66 out of 5 stars
476 ratings
  1. 5 stars
  2. 4 stars
  3. 3 stars
  4. 2 stars
  5. 1 star
  • The progress I have made since starting to use codecademy is immense! I can study for short periods or long periods at my own convenience - mostly late in the evenings.
    Chris
    Codecademy Learner @ USA
  • I felt like I learned months in a week. I love how Codecademy uses learning by practice and gives great challenges to help the learner to understand a new concept and subject.
    Rodrigo
    Codecademy Learner @ UK
  • Brilliant learning experience. Very interactive. Literally a game changer if you're learning on your own.
    John-Andrew
    Codecademy Learner @ USA

Our learners work at

  • Google Logo
  • Meta Logo
  • Apple Logo
  • EA Logo
  • Amazon Logo
  • IBM Logo
  • Microsoft Logo
  • Reddit Logo
  • Spotify Logo
  • Uber Logo
  • YouTube Logo
  • Instagram Logo

Frequently asked questions about the Basics of Regular Expressions

  • Regular expressions (RegExs) are sequences of characters defining a pattern of text that needs to be found.

Join over 50 million learners and start Learn the Basics of Regular Expressions today!

Unlock additional features with a paid plan

  • Practice Projects

    Guided projects that help you solidify the skills and concepts you're learning.
  • Assessments

    Auto-graded quizzes and immediate feedback help you reinforce your skills as you learn.
  • Certificate of Completion

    Earn a document to prove you've completed a course or path that you can share with your network.