正则表达式来检查长度与多个选项

我需要验证的日期格式，即可以是11/11/11或11/22/2013，即一年块可以在YY或YYYY和完整格式要么MM/DD/YY或MM/DD/YYYY正则表达式来检查长度与多个选项

我有这个代码

^(\d{1,2})\/(\d{1,2})\/(\d{4})$

，我已经试过

^(\d{1,2})\/(\d{1,2})\/(\d{2}{4})$ // doesn't works, does nothing

和

^(\d{1,2})\/(\d{1,2})\/(\d{2|4})$ // and it returns null every time

PS：我使用Javascript/jQuery的应用它

来源

2013-08-26 zzlalani

^(\d{1,2})\/(\d{1,2})\/(\d{2}|\d{4})$

两个\d{2}{4}和\d{2|4}是不正确的正则表达式表达。你所要做的两位数和为数字单独和组合，然后利用或：(\d{2}|\d{4})

来源

2013-08-26 12:20:26 MarcinJuraszek

优秀（ Y）.. – zzlalani

@zzlalani这不是验证日期，如48/66/5432？ –

@Sniffer是的，它会的。但我认为这不是问题的一部分。但是，是的，我不会**我们的代码来验证任何应用程序中的任何日期字段。 – MarcinJuraszek

你可以使用：

^\d\d?/\d\d?/\d\d(?:\d\d)?$

解释：

The regular expression: 

(?-imsx:^\d\d?/\d\d?/\d\d(?:\d\d)?$) 

matches as follows: 

NODE      EXPLANATION 
---------------------------------------------------------------------- 
(?-imsx:     group, but do not capture (case-sensitive) 
         (with^and $ matching normally) (with . not 
         matching \n) (matching whitespace and # 
         normally): 
---------------------------------------------------------------------- 
^      the beginning of the string 
---------------------------------------------------------------------- 
    \d      digits (0-9) 
---------------------------------------------------------------------- 
    \d?      digits (0-9) (optional (matching the most 
          amount possible)) 
---------------------------------------------------------------------- 
/      '/' 
---------------------------------------------------------------------- 
    \d      digits (0-9) 
---------------------------------------------------------------------- 
    \d?      digits (0-9) (optional (matching the most 
          amount possible)) 
---------------------------------------------------------------------- 
/      '/' 
---------------------------------------------------------------------- 
    \d      digits (0-9) 
---------------------------------------------------------------------- 
    \d      digits (0-9) 
---------------------------------------------------------------------- 
    (?:      group, but do not capture (optional 
          (matching the most amount possible)): 
---------------------------------------------------------------------- 
    \d      digits (0-9) 
---------------------------------------------------------------------- 
    \d      digits (0-9) 
---------------------------------------------------------------------- 
)?      end of grouping 
---------------------------------------------------------------------- 
    $      before an optional \n, and the end of the 
          string 
---------------------------------------------------------------------- 
)      end of grouping 
----------------------------------------------------------------------

来源

2013-08-26 12:34:01 Toto

正则表达式来检查长度与多个选项

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