Vim how to replace leading line number from source file

Today I needed to replace the leading line number from a source file that was forwarded to me probably gotten from an html representation of a source repository of some sort. I know, definitely not the best way to acquire a source file this way but a good exercise nonetheless.

In Vim the following would do the trick:

:%s/^\s*\d\+//g

%    --> for each line
^    --> beginning of the current line
\s*  --> match any leading space characters
\d\+ --> match any number of digits (one or more)
     --> replace with nothing