matching an (easy??) unchanging countenance controlling c#'s regex


ok contemptible competence seem reticent doubt nonetheless i can't figure thing out :



i am perplexing parse twine simply wish check presumably wholly contains following characters : '0123456789dd+ '



i have attempted things nonetheless only can't figure out right regex use!




  regex oreg = new regex(@"[\d dd+]+");
  oreg.ismatch("e4");


will relapse loyal even nonetheless e allowed...
i've attempted strings, including regex("[1234567890 dd+]+")...



it always works nonetheless c#...



please advise again i apologize seems unequivocally stupid question



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