Additional validation to form js

For a particular field I want to include extra validation (11 test for Dutch social security number) and I was wondering if anyone knows where I need to add this in the standard form validation javascript from AC? It should stop the form submit and show an alert().

Thanks in advance!

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Did you ever get to the bottom of this?

I need to add some regex to a field in one of our forms and Iā€™m not sure where to add it. Would be good to know if you worked it out?

Thanks

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