I have a Canon Powershot SD600. It was working perfectly well until a couple of weeks ago. It is dependent on WIA and WIA won't start. I keep getting a "memory could not be written" message" when trying to start WIA.
I've uninstalled and reinstalled the Canon software multiple times and the system recognizes the hardware when I plug in through a USB port. But I can't upload any picture to the computer from my camera because none of those functions work without WIA launching (which it won't do).
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern: