I'm having trouble with a field update formula that would strip off the hyphen that is added to the end of the new opportunity name when a lead is converted.  Is it standard for a hyphen to be appended to the Opp name during the convert process?

I'm having trouble with a field update formula that would strip off the hyphen that is added to the end of the new opportunity name when a lead is converted.  Is it standard for a hyphen to be appended to the Opp name during the convert process?