I am building an e-mail list manager that should allow the user the ability to import a CSV or TXT file they exported from Excel or their e-mail client. I am using ASPUpload to upload the file to the server and then I use FileSystemObject to open the file, Split() to put the contents into an array and then ADO to get the contents into the database. The problem I can forsee, is with error validation on the CSV or TXT file. I have been researching quite a bit of code and they all validate different things. Some replace quotes, others replace spaces, others replace line breaks, some remove column headers, etc. The CSV file I am using to mock up the application has one easy to follow format, but that is not real-world.
Here are my requirements:
The file should have only one column. The column should contain all e-mail addresses and I need to make sure I don't import the column header if the file contains one. Each e-mail address can have no trailing spaces, line breaks, etc.
Should I use a regular expression to do all this validation? And if so, what are all the things I should check for? In what linear fashion should I do the validation?
Please ask questions if need be. Thanks in advance for all your help.