> It might be kind of excessive to implement regular expression parsing > in the server for this... but I was thinking maybe specifying a range > of acceptable characters, or maybe an array with characters or ranges > of characters to accept.
Well, if there is a way for the client to specify more exotic
constraints, maybe regexps are overkill (for instance with some
callback mechanism). But I fear that less than that would be
cumbersome: for instance, if you want a field to enter an identifier,
you often have a syntax where the first character is more restricted
than what follows.
Just my .2 $...
Fr�d�ric
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