title: How can I provide an OR operator in regular expressions?
body: <p>I want to match my string to one sequence or another, and it has to match at least one of them.</p>
  
  <p>For <code>and</code> I learned it can be done with:</p>
  
  <pre><code>(?=one)(?=other)
  </code></pre>
  
  <p>Is there something like this for OR?</p>
  
  <p>I am using Java, Matcher and Pattern classes.</p>