asp.net - RegularExpressionValidator to limit input length and allow empty strings -

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i'm bad regex , looking @ question identical can't work need.

i use regularexpressionvalidator allow character 255 characters or nothing @ all. tried, 

validateexpression="^.{255}$"

but throws unhanded exception when textbox i'm checking empty.

i've tried 

validateexpression="^.{,255}$"

thank rodney

did try ^.{0,255}$? not sure exception getting though.

edit: also, if struggling .net regex, regex hero tester great help. know there other sites, 1 far best, if ask me.


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