$ find . -iregex "./[1-9]+.+"

$ ls {0..9}*
ls: cannot access '1*': No such file or directory
ls: cannot access '2*': No such file or directory
ls: cannot access '3*': No such file or directory
ls: cannot access '5*': No such file or directory
ls: cannot access '6*': No such file or directory
ls: cannot access '7*': No such file or directory
ls: cannot access '8*': No such file or directory