[FormBuilder] Validate option

I want to use a hashref for a validate option so I can set different  
validation for javascript and perl. It's more convenient for me to  
apply this via the field method rather than the new method. The  
documentation implies that the field method only really supports a  
standard regex but I've found that a hashref works just fine too. So,  
the question is:  is there any reason I should not use a hasref for  
the validate option of the field method?

Thanks!

Guy

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