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Good, free tutorials to learn regex?

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  1. is an online tool to learn, build, and test Regular Expressions.

    Personally, I use regexr. It can build a regex for you, but also explains what each step does.
  2. Extensive regex tester and debugger with highlighting for PHP, PCRE, Python and JavaScript. is a nice website where you instantly see the effect of your regex.
  3. RegexOne offers learning regular expressions with simple, interactive examples.

    This is an interactive game where you learn regex:
  4. Welcome to the fantastic world of nerdy regex fun!

    Https:// - this is kinda fun way to learn.