Checking whether the system can pick up invalid email formats.

Take a look at the [[java.util.regex][http://www.cs.auckland.ac.nz/references/java/java1.5/api/java/util/regex/package-summary.html]] package for information on how to use regular expressions.

 * Here are some valid emails.

|''Validate Email''|
|''Email''||''Valid''|
|john@yahoo.com||true|
|john.smith@yahoo.com||true|
|apple_craig@hotmail.com||true|
|nikky@auckland.ac.nz||true|

 * Here are some invalid emails

|''Validate Email''|
|''Email''||''Valid''|
|john||false|
|craig@@mail.com||false|
|http://www.google.com||false|
|rick@fit..org||false|
|rick@fit||false|