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我使用从regexlib.com这个模式匹配 -Scala的模式匹配
^(?=\d)(?:(?:31(?!.(?:0?[2469]|11))|(?:30|29)(?!.0?2)|29(?=.0?2.(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00)))(?:\x20|$))|(?:2[0-8]|1\d|0?[1-9]))([-./])(?:1[012]|0?[1-9])\1(?:1[6-9]|[2-9]\d)?\d\d(?:(?=\x20\d)\x20|$))?(((0?[1-9]|1[012])(:[0-5]\d){0,2}(\x20[AP]M))|([01]\d|2[0-3])(:[0-5]\d){1,2})?$
这似乎是做工精细=>
val RE = """^(?=\d)(?:(?:31(?!.(?:0?[2469]|11))|(?:30|29)(?!.0?2)|29(?=.0?2.(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00)))(?:\x20|$))|(?:2[0-8]|1\d|0?[1-9]))([-./])(?:1[012]|0?[1-9])\1(?:1[6-9]|[2-9]\d)?\d\d(?:(?=\x20\d)\x20|$))?(((0?[1-9]|1[012])(:[0-5]\d){0,2}(\x20[AP]M))|([01]\d|2[0-3])(:[0-5]\d){1,2})?$""".r
RE.findAllMatchIn("31/12/2003 11:59:59 PM").foreach(println) //prints 31/12/2003 11:59:59 PM
RE.findAllMatchIn("31/122003 11:59:59 PM").foreach(println) //prints nothing
不过,我不能够匹配它直接像这 -
"31/12/2003 11:59:59 PM" match {
case RE(_) => println("Yes")
case _ => println("No")
}
这打印“否”。我期待“是”
我想,我的眼睛被永久由此受损。我怎么能看不到它? 请不要这样做给人。只要使用'DateFormat' – Dima
同意。我没有在生产中使用它。 – abipc