RegexLearn
regexlearn.com
An interactive regex learning platform with visual pattern matching, immediate feedback as you type, and a structured curriculum from basic character classes to advanced lookaheads and backreferences.
Why it is useful
The visual feedback loop — showing exactly which characters in the test string match each part of your pattern as you type — makes regex click in a way static tutorials don't. The curriculum is well-paced and the interactive exercises build real fluency rather than pattern memorization. Most developers learn regex by copying Stack Overflow answers; this gives you the underlying mental model. Free with no account.
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