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Limit characters in a PDF form?

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Elysiana:
I am making a fillable PDF form and two of the fields need to be alphanumeric only. Apparently people don't understand "alphanumeric" or "A-Z 0-9 ONLY" so I'd love to just make it so that they can't possibly put anything other than those characters in the field. I'm not really sure how to look this up; I've done a few searches with no luck and I don't know if it's not possible or I'm just not searching for the right terms. The Acrobat forums had something about setting it up for just alpha but they didn't explain how to do it (something about adding JavaScript but I have no idea how you even do that). I'm like a lost puppy!

(I hope I'm asking in the right spot; it's not game-related but it's program-related.)

pwhodges:
Is this helpful, or do you need more?

Elysiana:
I'm almost positive that's what I'm looking for, but I have no idea where to put that info. I've been searching through LiveCycle's help files and I'm finding stuff about validation but when I try to enter that script it says it's invalid so I must be in the wrong place.

I'd rather not sign up for Adobe's forums since I have a swiped copy, but I may have to.

pwhodges:
You are using Acrobat to generate the form, right?  I'll link to my work machine (where I have a copy) later this evening and try to work it out.

Elysiana:
Using Adobe LiveCycle Designer, actually (which I guess is built into Acrobat, so yes).

You're awesome, thank you!

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