title: Validate E-Mail with a Regular Expression in Java
body: <p>I want to validate an E-Mail Address with a regular expression in Java. The format of the E-Mail Address is </p>
  
  <blockquote>
    <p>firstname.lastname@company.xx</p>
  </blockquote>
  
  <p>The E-Mail address don't contains upper case letters or numbers. The only expression I have is this</p>
  
  <pre><code>([a-z]+(?:[.][a-z]+)*)
  </code></pre>
  
  <p>but that didn't help me. It is important, that the expression looks for the "." between the firstname and lastname. </p>
  
  <p>It would be nice, if someone could help me with this expression.</p>