This script checks a path to see if a folder exists.
If the folder does exist you will get output "The folder has previously been created. No action taken"
If not it will create the folder. Then adds one user modify permission to the folder.
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Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern: