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I would like to know a method or a good article or a book that helps me understand the meaning

of some regular expressions like these for example :








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thank you it was useful for me plus it helped find other sites like it . However I cannot find an explanation to this




Could you please provide me with a string that match the regular expression above and explain to me what does two caret TOGETHER one inside outside the bracket do because I could not find an explanation in the internet?

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