Let's say I have a text field that's been indexed with the standard
tokenizer, and I want to match the docs that have credit card numbers in
them (this is for altruistic purposes, not nefarious ones!). What's the
best way to build a search that will do this?

Searching for "???? ???? ???? ????" seems to return inconsistent results.

Maybe a regex search? "[0-9]{4}?[0-9]{4}?[0-9]{4}?[0-9]{4}" seems like it
should work, but that's not matching the docs I think it should either...

Any suggestions?

Thanks In Advance!

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