title: How to match only strings that do not contain a dot (using regular expressions)
body: <p>I'm trying to find a regexp that only matches strings if they <em>don't</em> contain a dot, e.g. it matches <code>stackoverflow</code>, <code>42abc47</code> or <code>a-bc-31_4</code> but doesn't match: <code>.swp</code>, <code>stackoverflow</code> or <code>test.</code>.</p>