18 Match All Letters and Numbers - RegEx - FreeCodeCamp EXPLAINED - JavaScript Algorithms FCC Guide

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FreeCodeCamp - Javascript Algorithms & Data Structures Course
Regular Expressions Sub-course
Challenge 18 Match All Letters and Numbers
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These explanations help ALOT to get a better in depth knowlege and understanding. appreciate you as always.

LibraryOfTheOligarchs
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Why was the +(addition) operator used in the above example?

By that I mean can you explain this part: \w+

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