Is there some standard email validator code sample for Java ME or BlackBerry?
You can simply google around for email validation regex pattern. Thats the easiest and efficient way to check email string format. see the link below.
http://www.zparacha.com/ultimate-java-regular-expression-to-validate-email-address/
http://leshazlewood.com/2006/02/04/java-email-address-validation-the-right-way-regular-expression/
You will find many other examples for regex. For Regex, check the following link.
http://www.regular-expressions.info/java.html