Question: Suppose that the only characters allowed in a user name are letters, digits, an underscore (_), a hyphen (-), or a period (.). Write a

Suppose that the only characters allowed in a user name are letters, digits, an underscore (_), a hyphen (-), or a period (.).

Write a boolean expression that is true only if the variable user_name contains a valid user name.

You must use one or more regular expressions.

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