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I have an attribute field that contains strings like "iuyluf45567kjyyr347fklj". All strings contain various amount of characters and digits (there is no clear pattern) but each string contains 2 groups of numbers. I have to extract those numbers as new attributes. I managed to extract first number using Field Calculator: regexp_substr('iuyluf45567kjyyr347fklj', '(\\d+)') gives me 45567. But I have no idea how to extract the second one.

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You can try 

regexp_substr('iuyluf45567kjyyr347fklj', '(\\d+)[^\\d]*$')

It will look for one or more digit that does not contain another digit between it and the end of the string

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