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# Purpose: a part of a series of examples of Tk code validating # the input of a user.# # This example takes as an argument a possible IP address.For example, perhaps they run a game resale shop, or maybe they just enjoy collecting.

# It currently doesn't work due to a problem figuring out how to impose # the range values of the regular expression onto the values being entered # by the user, so that one can only enter valid IP addresses.It would be easy to add, just pass a %V from the -vcmd option & add extra arg to func then do primarily the same checks except force the length to be exactly 4 and don't do the trick of letting the last one blank.If ti isn't complete you could flag it with a color change, or pop up a box letting user know it wasn't done.First, let's assume we have the following routes defined in our object.If the validation rules pass, your code will keep executing normally; however, if validation fails, an exception will be thrown and the proper error response will automatically be sent back to the user.

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Sometimes you may wish to stop running validation rules on an attribute after the first validation failure.

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