Extract digits from string - Google spreadsheet

Question

In Google spreadsheets, I need a formula to extract all digits (0 to 9) contained into an arbitrary string, that might contain any possible character and put them into a single

Answer 1

These work with integers, decimals and negatives:

=REGEXEXTRACT(A2,"-*\d*.?\d+")
=VALUE(REGEXEXTRACT(A2,"-*\d*.?\d+"))