ALBANY — John Rzeznik, the front man for the Goo Goo Dolls, came out alone on Wednesday night at The Egg’s sold-out Hart Theater, sat on a stool with his acoustic guitar and started talking.“I wrote a lot of songs about women and regrets. As I got older, I wrote more about regrets. ... Now I realize that life is a string of amazing moments, with regrets.”He sang “Sympathy,” then sang “Two Days in February.” Robby Takac, the other Goo Goo Dolls original, came out halfway through the next song, sat in the other stool on the stage to strum an acoustic guitar. By the next song a full band came out