javascript - 移动字符串的各个部分

Question

假设我有一个字符串:

var mystring = "01/27/2016";

然后我想检查该字符串是否包含 /:

if(mystring.match("/")){
//Then transform "01/27/2016" to "2016-01-27"
}

我怎样才能实现它？ 最好的问候

Answer 1

您可以使用String#replace :

/(\d+)\/(\d+)\/(\d+)/gi

• 1st Capturing group (\d+)

  \d+ match a digit [0-9]

  Quantifier: + Between one and unlimited times, as many times as possible, giving back as needed [greedy]

• \/ matches the character / literally

• 2nd Capturing group (\d+)

  \d+ match a digit [0-9]

  Quantifier: + Between one and unlimited times, as many times as possible, giving back as needed [greedy]

• \/ matches the character / literally

• 3rd Capturing group (\d+)

  \d+ match a digit [0-9]

  Quantifier: + Between one and unlimited times, as many times as possible, giving back as needed [greedy]

// is replacing
document.write('01/27/2016'.replace(/(\d+)\/(\d+)\/(\d+)/gi, '$3-$1-$2') + '<br>');

// is not replacing
document.write('01.27.2016'.replace(/(\d+)\/(\d+)\/(\d+)/gi, '$3-$1-$2') + '<br>');