[add] Asserting email type

api-payroll/src/service/Asserts.php

@@ -56,5 +56,18 @@ class Asserts{
             throw new Exception($errorMessage);
         }
     }
+
+    /**
+     * Compares a string against a regex to determine if it's an email
+     *
+     * @param $string string
+     * @param $errorMessage string
+     * @throws Exception
+     */
+    function isEmail($string, $errorMessage){
+        if(!filter_var($string, FILTER_VALIDATE_EMAIL)){
+            throw new Exception($errorMessage);
+        }
+    }
 }
 ?>