About RegexOne
RegexOne is a set of interactive lessons that teach regular expressions, the patterns used to search and match text. Each lesson asks you to write a pattern that matches a set of example lines.
What it does
The lessons start with simple characters and build up to groups, repetition and optional parts. As you type a pattern, the matching text in each line is highlighted, so you see the result right away. Each exercise has a solution you can read if you get stuck. The site also includes a notes page that lists common syntax such as digits, whitespace and character classes.
Key features
- Patterns that check as you type
- Lessons from single characters to groups
- Notes on digits, whitespace and character classes
- Repetition and optional characters
- Solutions for each exercise
Who it's for
RegexOne suits beginners who want a structured way to learn regular expressions. It is also useful for developers, analysts and anyone who searches logs or spreadsheets with patterns.
Pricing and good to know
The lessons are free to use. The page asks visitors to consider a small donation to support the site, and this is optional. Regular expression syntax can differ between programming languages, so check your language's documentation for edge cases. The lessons focus on the common core that most tools share.
Highlights
- Patterns that check as you type
- Lessons from single characters to groups
- Notes on digits, whitespace and character classes
- Repetition and optional characters
- Solutions for each exercise
