Nested styles - number in front of word - InDesign

Hi,
Anybody knows if this is possible to do at all with nested styles in InDesign?
To have a style applied to every number in front of the word, no matter where the number appears in text.
Example:
21In ac interdum elit. Duis 135consequat, lectus vel aliquam volutpat, ligula sem tincidunt justo, id aliquam nunc lacus in dui. Quisque ut consectetur mauris. Cras 8pharetra tempus felis non vulputate. Fusce 6molestie bibendum odio, non volutpat nunc aliquet vitae. Vivamus porta bibendum 12congue. Phasellus leo nisl, tincidunt ut adipiscing sit amet, 1posuere vel augue.

As you see, number is always connected to the word, but it can be any number and sometimes 1, sometimes 2, sometimes 3 digits, for example.

Any idea?
I can't figure it out.

Thanks.