title: Regular expression: find spaces (tabs/space), but not newlines
body: <p>How can I have a regular expression that tests for spaces or tabs, but not newlines?</p>
  <p>I tried <code>\s</code>, but I found out that it tests for newlines too.</p>
  <p>I use <a href="https://en.wikipedia.org/wiki/C_Sharp_%28programming_language%29" rel="noreferrer">C#</a> (.NET) and <a href="https://en.wikipedia.org/wiki/Windows_Presentation_Foundation" rel="noreferrer">WPF</a>, but it shouldn't matter.</p>