Javascript - 正则表达式验证日期格式 [英] Javascript - Regex to validate date format

问题描述

有没有办法在JavaScript中使用regex来验证多种格式的日期，例如：DD-MM-YYYY或DD.MM.YYYY或DD / MM / YYYY等？我需要所有这些在一个正则表达式，我不是很好用它。到目前为止，我已经想到了这个： var dateReg = / ^ \d {2} -\d {2} -\d {4} $ /; 对于DD-MM-YYYY。我只需要验证日期格式，而不是日期本身。

Is there any way to have a regex in JavaScript that validates dates of multiple formats, like: DD-MM-YYYY or DD.MM.YYYY or DD/MM/YYYY etc? I need all these in one regex and I'm not really good with it. So far I've come up with this: var dateReg = /^\d{2}-\d{2}-\d{4}$/; for DD-MM-YYYY. I only need to validate the date format, not the date itself.

推荐答案

你可以使用一个字符类（ [./-] ）以便分隔符可以是任何已定义的字符

You could use a character class ([./-]) so that the seperators can be any of the defined characters

var dateReg = /^\d{2}[./-]\d{2}[./-]\d{4}$/

或者更好的是，匹配第一个分隔符的字符类，然后将其作为一组捕获（[./-]）并使用对捕获的组 \1 的引用来匹配第二个分隔符，这将确保两个分隔符相同：

Or better still, match the character class for the first seperator, then capture that as a group ([./-]) and use a reference to the captured group \1 to match the second seperator, which will ensure that both seperators are the same:

var dateReg = /^\d{2}([./-])\d{2}\1\d{4}$/

"22-03-1981".match(dateReg) // matches
"22.03-1981".match(dateReg) // does not match
"22.03.1981".match(dateReg) // matches

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