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I haven't seen it mentioned here yet, but wanted to throw out (https://regexr.com/) as a decent resource into writing regular expressions. I think I haven't needed to use a tutorial because of how easy it makes writing them.

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I'll second this, it's immensely useful when I can't wrap my head around a regular expression.

regex101.com is my go-to, because it supports regex flags and Python regexes.

Going to add regexper.com which is really good for explaining RegEx patterns.

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