• "[a-z]+[0-9]*@\w+[.](com|com.uk|com.np|net|com.in)$"

    This is not enough to validate all emails, try this:

    [a-zA-Z0-9]+([-\._][a-zA-Z0-9]+)*@(\w+(-\w+|_\w+)*\.)+[a-zA-Z]+$