Formula to extract numbers from a text string

Question

How could I extract only the numbers from a text string in Excel or Google Sheets? For example:

A1 - a1b23eg67
A2 - 15dgrgr156

Result desir

Answer 1

You can do it with capture groups in Google Sheets

=REGEXREPLACE(A1,ʺ(\d)|.ʺ,ʺ$1ʺ)

Anything which matches the contents of the brackets (a digit) will be copied to the output, anything else replaced by an empty string.

Please see @Max Makhrov's answer to this question

or

=regexreplace(A1,ʺ[^\d]ʺ,ʺʺ)

to remove anything which isn't a digit.