Add RegExp Playground (#5885)

* Update free-programming-interactive-tutorials-en.md

* Update free-programming-interactive-tutorials-en.md

* Fix linting errors

* Fix linting errors

* Update more/free-programming-interactive-tutorials-en.md

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

* Update free-programming-interactive-tutorials-en.md

Add another resource and rename the section

* Update free-programming-interactive-tutorials-en.md

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>
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Mohammad Hossein Rabiee 2021-10-12 17:29:48 +03:30 committed by GitHub
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* [PostgreSQL](#postgresql)
* [Python](#python)
* [R](#r)
* [Regular Expressions](#regular-expressions)
* [Ruby](#ruby)
* [Rust](#rust)
* [Scala](#scala)
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* [R Tutorial](https://www.w3schools.com/r) - W3Schools
### Regular Expressions
* [Regex Crossword](https://regexcrossword.com) - Ole Michelsen, Maria Hagsten Michelsen
* [RegExp Playground](https://projects.verou.me/regexplained) - Lea Verou
### Ruby
* [CodeCademy Ruby](https://www.codecademy.com/learn/ruby)