问题是我必须从提供的文本中提取电子邮件地址。这是我的最终代码: var a = "A towel, it says, is about the most massively useful thing an interstellar hitchhiker can have. Partly it has great practical value - you can wrap it around you dent@vogon.com for warmth as you bound across the cold moons of Jaglan Beta; you can lie on i