Extract digits with regular expression in BASH

Question

I have a script that runs a command like
$exiftool 3PDki5ZyhBgnoTEUu4JP.mov|grep -m1 Duration and depending on the files I get back results like these

Duration                        : 01:25  
Duration                        01:25  
Duration                        01.25  

I would like to be able to extract from these strings only the time, that is, 01:25 or 1.25.

Answer 1

try this:

....|grep -o "[^ ]*$"

or this short one:

...|awk '$0=$NF'