yyyy-mm-dd格式的任意日期
\d\d\d\d-\d\d-\d\d \d\d\d\d-\d\d-\d\
\d\d\d\d-\d\d-\d\d \d\d\d\d-\d\d-\d\
阅读背景：
正则表达式 实例
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