Weddings are personal so rates vary. I wish I could tell you the exact amount but that's so impersonal. If you need a ballpark, expect to spend around $3,000. That number can go up or down based on your particular needs.
PLEASE DO YOUR HOMEWORK
I encourage you to ask your potential photographer (myself included) for FULL wedding portfolios. You should know what you're getting. I'm always sure my clients have reasonable expectations and that at least we like each other before anyone signs a contract. This goes both ways :)