I'm looking for a simple php script I can drop into a folder and it will auto generate an album of all the current folder images.
I do not want to configure it
I do not want to spend an hour reading about it either.
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: