Regular expression problem SELECT FIRSTNAME,LASTNAME, EMAIL
   FROM CUSTOMERS
   WHERE REGEXP_LIKE(EMAIL,'[A-Z0-9._%-]{1,10}@[a-z0-9._%-]{1,5}\.[net|com]','i');


I know this is not practical or make a ton of sense, but its a constraint I'm working with: email address with upto 10 characters prior to @ followed by upto 5 characters, then a '.' and finally the .net or .com extension. This works for the most part except the 1-10 constraint on the first half does not appear to do what I'd like.
It pulls in pretty much any number characters prior to the '@'.
For example it should accept jreed but not jodywilliamreed as the later is more than 10 characters. Anyone see what I've done here that would cause this problem?
edit: I'm using sql developer with oracle
Try adding the ^ character to your regex, which means to match the position at the beginning of the string, like this 

^[A-Z0-9._%-]{1,10}@[a-z0-9._%-]{1,5}\.[net|com]