title: email validation question [abnf] [RF 5322]
body: <p>What does the following mean in the sentence below <code>1*( atext / "." ) "@" ldh-str 1*( "." ldh-str )</code></p>
  
  <p>Could someone break it down in simple terms? </p>
  
  <p>Any string that matches the following [ABNF] production:</p>
  
  <pre><code>1*( atext / "." ) "@" ldh-str 1*( "." ldh-str )
  </code></pre>
  
  <p>Where atext is as defined in [RFC 5322], and ldh-str is as defined in [RFC 1034].</p>