解释用户输入的日期何时成为Python搜索查询的一部分？

Question

我想写一个搜索算法，从搜索查询字符串中解析日期：

比如说

query1 = "2014 phone"
query2 = "Blue Sky May 3, 2013"
query3 = "Telephone equipment 6/7/2004"

将被解释为：

string1 = "phone"
year1 = "2014"
month1 = ""
day1 = ""

string2 = "Blue Sky"
year2 = "2013"
month2 = "05"
day2 = "03"

string3 = "Telephone equipment"
year3 = "2004"
month3 = "06"
day3 = "07"

在Python中实现这一点的最佳方法是什么