这个的正则表达式怎么写

我想要截取以下字符串的“中山”（不带双引号），怎么写正则表达式，和怎么匹配？

"id":"7dd4f090537e4866a2125c5a4fc1db03","areaCode":"0760","provinceCode":"051","cityCode":"556","cityName":"中山","provinceName":"广东",

Regex reg = new Regex("\"cityName\":/(?[^\"]+)\".*");我这么写为什么是错的？求高手回答

 Regex reg = new Regex("\"cityName\":\"([^\\\"]+)\"");