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I need a regex that will allow users to post this:

0000-0000-0000

Can somebody here provide me with it or a page that can give me some hits about how to write it?

I already google it btw...

For validation, try this:

@^\d{4}-\d{4}-\d{4}$@

If you need to extract or match against a text containing the code, try this:

@(?<!\d)\d{4}-\d{4}-\d{4}(?!\d)@

Note: \d matches any digit.

Thanks Masashi, it worked (both, for what I'm doing). (: