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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!

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  • 2
    $\begingroup$ check DigitCharacter or NumberString. $\endgroup$ – Kuba Aug 10 '17 at 19:44
  • $\begingroup$ at least closely related: 8938 $\endgroup$ – Kuba Aug 10 '17 at 19:46
  • $\begingroup$ Thanks! This is exactly what I was looking for. $\endgroup$ – Diffycue Aug 10 '17 at 19:46
  • $\begingroup$ Also related: (73172) $\endgroup$ – Mr.Wizard Aug 11 '17 at 2:14
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data = "DataSummary_1N_5M_10L.dat";

StringCases[data, NumberString]

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

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  • 3
    $\begingroup$ StringCases[str, DigitCharacter ..] should also work. $\endgroup$ – J. M. is away Aug 10 '17 at 19:49
  • $\begingroup$ Indeed, it does ! Very elegant $\endgroup$ – eldo Aug 10 '17 at 19:53

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