How to parse, format, or validate a phone number?

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    Hello.
    Trying to come up with something with free form validation: searching, validating and formatting a phone number and stumbled upon the library libphonenumber . I looked, I was crazy about the sizes, looked again in the hope of finding the desired algorithm of work, which works out here , but my knowledge was not enough.
    If you have used this library, you know what you need to get out of there, so as not to pull hundreds and tens of KB to search and validate a phone number, I would be grateful for your help.
    JavaScript Reese Cook, Nov 23, 2019

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