Q.1 then manually input text (material) or find an article, use regular expressions to find all email and mobile phone number

Question 2. Write a function to determine whether a user input characters meet certain requirements
Requirements: 8 to 20 characters in length, can only contain lowercase letters is, not for 4 Numbers, the underscore, and contains at least two of these
At the output page 5 and the testing results of string

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Need to code and simple explanations