diff --git a/src/Support/Expression.php b/src/Support/Expression.php
index 7ce5395..7ce8fff 100644
--- a/src/Support/Expression.php
+++ b/src/Support/Expression.php
@@ -86,8 +86,8 @@ public function priority($operator)
 
     public function lex($string)
     {
-        $bad  = [' or ', '-', ' ', '@', '.'];
-        $good = [ '|'  , '~', '&', '&', '&'];
+        $bad  = [' or ', ' -', ' '];
+        $good = ['|', '~', '&'];
 
         $string = str_replace($bad, $good, $string);
         $string = mb_strtolower($string);
diff --git a/tests/support/ExpressionTest.php b/tests/support/ExpressionTest.php
index a42c804..dddccd3 100644
--- a/tests/support/ExpressionTest.php
+++ b/tests/support/ExpressionTest.php
@@ -15,7 +15,6 @@ public function testToPostfix()
         $this->assertEquals(['great', 'awsome', '|'], $exp->toPostfix("great or awsome"));
         $this->assertEquals(['great', 'awsome', '&'], $exp->toPostfix("great awsome"));
         $this->assertEquals(['email', 'test', '&', 'com', '&'], $exp->toPostfix("email test com"));
-        $this->assertEquals(['email', 'test', '&', 'com', '&'], $exp->toPostfix("email@test.com"));
         $this->assertEquals(['first', 'last', '&', 'something', 'else', '&', '|'], $exp->toPostfix("(first last) or (something else)"));
     }
 }