Find all runs in a string containing only numbers

Question

The documentation has the following example to find all runs in a string containing only "a" and "b":

StringCases["aababbcccdbaa", ("a" | "b") ..]
{"aababb", "baa"}

I would like to find all runs in a string containing only numbers. E.g.,

findnumbers["DataSummary_1N_5M_10L.dat"]
{"1", "5", "10"}

What is the nice way to do this, besides just writing out explicitly in the second argument of StringCases ("1" | "2" | "3" | "4" |...etc... ) ..? Thanks!

Answer 1

data = "DataSummary_1N_5M_10L.dat";

StringCases[data, NumberString]

{"1", "5", "10"}