how do I search string and see if any letters are there? : <p>I need to find out if a string contains letters in it. I think I've tried every thing in the world and they haven't worked. I've tried many examples from here (and other places) but they don't work either</p>

<p>I know there are a lot of similar questions. I've read them and they don't work for me, so I'm asking again. </p>

<p>Any help is appreciated.</p>
