How to extract a number from a string

I have this string:

"                            <li>Ponto de orvalho: 16&#176; C</li>"

and I want to extract the number 16, but this number can change.

I was doing this: Torvalhoactual=str2num([tline(57),tline(58)]);

but since the number can change to 1 digital number this code crashes

Answer 1

[Azzi Abdelmalek]

string='de orvalho: 16° C</li'
out=str2double(regexp(string,'\d+','match'))