title: Splitting with Regex
body: <p>I want to split strings similar to <code>abc123</code>, <code>abcdefgh12</code> or <code>a123456</code> into letters and numbers, so that the result will be <code>{"abc", "123"}</code> etc.</p>
  
  <p>What is the simplest way to do it in C# 4.0? I want to do it with one regex.</p>