title: How to check if a string is numeric Julia
body: <p>Been scouring the internet trying to figure this out. Tried <code>isnumeric</code>, but that only works for an <code>AbstractChar</code>. I'd prefer not having to use <code>tryparse</code> if possible, but if that's the only solution so be it... If it is, why hasn't a function for checking if a string is numeric been implemented yet?</p>