The validation code is here https://github.com/NodeBB/NodeBB/blob/master/public/src/client/register.js. You can write a plugin to validate your own inputs.
Benchpress had no built-in way to do this. You'll need to add a helper in order to do subtraction.
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help with using helpers inside my theme
I managed to make some changes on my template from the client side, but am trying to do the same thing on the server side. I am trying to create a helper. bu...