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What scares many programmers?

For me, regular expressions are like the rules for boardgames that I don’t play that often: As the game progresses, I understand the rules and think I have a firm grasp on them, and when the game gets put away and I don’t play it for a while, I forget almost everything.

These days, I keep a couple of “interactive notebooks” with working code featuring useful regexes, paired with notes written in Markdown:

  • For Swift, Xcode Playgrounds does this well.
  • For other languages — Python, JavaScript, Kotlin, and C# — I used Jupyter Notebook.

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