I think it could be usefull if tou add a field in custom property definition so administrator could specify a regular expression to validate user Input.
In this way administrators could quite easily define a field in wich user can insert olny text properly formatted.
For example a code in the format AA-NNN in which AA can be one of ME, EL, PN, BU and NNN can be a number from 000 to 999
I know regular expression are not very known nor very easy to understand, but for this cases this would be very useful.
I have also had a client ask for a way to validate the input into a field. I looked at using this type of thing in the criteria of a transition between states, but it does not appear to recognize wildcard values.
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