Email validation – Regular Expressions

   <?php
   $email = "test@phpmoot.com";  
   $result = ereg("^([a-z0-9_]|\\-|\\.)+@(([a-z0-9_]|\\-)+\\.)+[a-z]{2,4}$", $email, $trashed);

   if($result) {
     $match = "Valid";
   }
   else{
     $match = "Invalid";
  }

  echo "Email address validation about $email is " . $match;
  ?>