RegexOne
Learn Regular Expressions with simple, interactive exercises
RegexOne is an interactive learning site for regular expressions, aimed at people who need to extract and match text in code, log files, spreadsheets, and documents. It teaches practical pattern writing through lessons that introduce syntax one step at a time, with exercises where typed patterns highlight matching text in sample lines.
The site includes a sequence of lessons covering characters, ranges, repetition, whitespace, anchors, groups, conditionals, and special characters, alongside practice problems such as matching decimal numbers, phone numbers, emails, HTML, filenames, URLs, and log data. Language guides are available for C#, JavaScript, Java, PHP, and Python, and each lesson provides notes summarizing the relevant syntax. Progression is gated by solving each task, with solutions available when needed.
RegexOne is structured for self-paced study by developers and other users who work with text matching. The site is offered as a free resource with an optional donation option; no paid editions, trials, or seat-based plans are described.
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