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Regular-Expressions.info provides an in-depth resource featuring a comprehensive regex tutorial, examples, reference, and tools for learning and mastering regular expressions.

RegExr is the best tool for learning and testing regular expressions and is used by developers and programmers worldwide.

RegexOne is an interactive online tutorial and exercise platform designed to teach users regular expressions quickly and practically.

RegexPal is an online tool for developers to learn, build, and test Javascript and PCRE regular expressions with real-time feedback.

RexEgg provides a comprehensive, advanced tutorial and reference for Regular Expressions (regex), covering syntax, tools, and application across multiple programming languages.

RegExLib is a searchable library and testing tool for regular expressions, used by developers needing pattern matching solutions across various programming languages.

XRegExp is a JavaScript regex library providing augmented and extensible regular expressions with modern syntax and flags for better cross-browser compatibility.

Regex Tester is an online tool to learn, build, and test Regular Expressions (RegEx) for Javascript and PCRE with real-time results.

Debuggex is an online visual regex tester tool supporting JavaScript, Python, and PCRE, allowing users to test and visualize regular expressions live.

Pythex is a real-time Python regular expression editor that runs entirely in the browser for quick regex testing and debugging.

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