How to accept only 4 or less than four hexadecimal characters in the control chain

Hello

I want to accept only up to 4 hexadecimal characters in a control of the chain. I don't want to use the property "hex display.

How is that possible? I have the string control key down? event event, I tried with the regex [0 - 9a - fA - F] {4}, but then I have to accept, left, right, delete, BACKSPACE, house keys as well.

I agree with Dennis that you seem to be making life difficult for yourself.  However, did you ask the equivalent (as I understand) "How can I allow the user to type '1', '2', 'Ctrl-A', 'B',"Ctrl-C","D"and get this recognized as the string"12BD".  If you really want to do, here's a way (I was lazy and left the response as an array of strings of 1 4 characters).  I use PlatMods to exclude have any 'change' other key moving downwards, convert the digital Char to a string, then count the letters of acceptable Hex and conditionally, add them to the results matrix, stopping when I have 4 characters.

Bob Schor

Tags: NI Software

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