Best way to do form validation?

[D_tunisia]

Can someone please advise me on the best command(s) to use to validate text entered into a form?

I have added validation to my script which checks whether there is actually any value in the field but I also need to check the following:

1) Whether a numeric or alpha-numeric entry has been made

2) Whether the entry starts with, ends with or contains within it a specific string or set of strings.

3) Whether the entry is in a specific format -- for example a date entry.

Thanks in advance for any help!

[etully]

Search these forums and Google for regexp or regular expressions. There are tons of tutorials out there.

[Tezread]

etully is right - search for 'form validation' and you will get tons of feedback. Not worth going over the whole process when it is archived already.

HTH

[Flyier]

I use these functions to validate name, phone number and e-mail -> http://mitkok.freehostia.com/?p=3