The function below checks if a field was left empty. If the field is blank, an alert box alerts a
message, the function returns false, and the form will not be submitted:
The function above could be called when a form is submitted:
The function below checks if the content has the general syntax of an email.
This means that the input data must contain an @ sign and at least one dot (.). Also, the @ must
not be the first character of the email address, and the last dot must be present after the @
sign, and minimum 2 characters before the end:
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