Slot filling for entities with infinite potential values but no regex pattern.

[klove]

My example is for a user looking for information on specific part numbers in Power VA. Something like "I am looking for stock and price of part abc-123" but we have over 30 million parts in our catalog from thousands of manufacturers with no regex pattern. What's the best way to go about training PVA to learn that something within the user utterance is a part number without supplying an exhaustive list or using a regex? Is it even possible?

Comparatively, in Google DF you can use a '@any' param and it will learn to pick out similar entities based on the training utterances you provide.