Checking user input

From: David (auto90059_at_hushmail.com)
Date: 09/09/03 

Date: Tue, 9 Sep 2003 20:56:26 +1000

I need to grab between 1 and 4 tags (the exact number will vary) from user
input within a script and then assign the tags to variables for later use in
an sql select .. from .. where .. in("$tag1", "$tag2") statement. The order
doesn't matter, but it's important that valid tags are entered - they each
must have the value "O" or "W" or "WT" or "VT". Is there a reasonably
robust way to do this?

Still on user input, I want ours to enter a date in the format YYYYMMDD. We
could potentially use a / or another char as a delimiter and strip it out
after if this makes things easier. Is it possible to check that the MM
field is between 1 and 12, or that the DD field is between 1 and 31? Can we
make sure that the string that's been entered is exactly 8 numeric
characters and otherwise conforms to our format?

Thanks,

David

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