求个正则表达式, 操作字符串

Question

原始数据:
'{"xxxx":"balabala","department":["7606418475131112177", "7606418475131112178", "7606418475131112179"],"xxxx":"balabala"}'
期待数据:
'{"xxxx":"balabala","department":[7606418475131112177, 7606418475131112178, 7606418475131112179],"xxxx":"balabala"}'

问题描述:
本字符串是由JSON转化得来, "xxx"用于表述其他不确定字段
department是不定长数组

需要将department数组中的字符串转换为数值, 即删掉引号
求个正则

多谢