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如何在JavaScript中使用类似于PHP的preg_match_all()的正则表达式匹配多个匹配项?

javascript

我正在尝试解析由以key &或value分隔的key = value对组成的url编码的字符串&

以下将仅匹配第一个匹配项,将键和值拆分为单独的结果元素:

var result = mystring.match(/(?:&|&)?([^=]+)=([^&]+)/)

字符串‘1111342 = Adam%20Franco&348572 = Bob%20Jones’的结果将是:

['1111342', 'Adam%20Franco']

使用全局标志’g’将匹配所有匹配项,但仅返回完全匹配的子字符串,而不返回单独的键和值:

var result = mystring.match(/(?:&|&)?([^=]+)=([^&]+)/g)

字符串‘1111342 = Adam%20Franco&348572 = Bob%20Jones’的结果将是:

['1111342=Adam%20Franco', '&348572=Bob%20Jones']

尽管我可以将字符串分割开来&并分别拆分每个键/值对,但有没有办法使用JavaScript的正则表达式支持来匹配/(?:&|&)?([^=]+)=([^&]+)/与PHPpreg_match_all()函数相似的模式的多次出现?

我的目标是通过一些子匹配来获得结果,例如:

[['1111342', '348572'], ['Adam%20Franco', 'Bob%20Jones']]

or

[['1111342', 'Adam%20Franco'], ['348572', 'Bob%20Jones']]

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2020-05-01

共1个答案

小编典典

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2020评论:现在,我们不再使用regex,而是URLSearchParams为我们完成了所有这些工作,因此不再需要自定义代码,更不用说regex了。


我建议使用另一种正则表达式,使用子组分别捕获参数的名称和值:

function getUrlParams(url) {
  var re = /(?:\?|&(?:amp;)?)([^=&#]+)(?:=?([^&#]*))/g,
      match, params = {},
      decode = function (s) {return decodeURIComponent(s.replace(/\+/g, " "));};

  if (typeof url == "undefined") url = document.location.href;

  while (match = re.exec(url)) {
    params[decode(match[1])] = decode(match[2]);
  }
  return params;
}

var result = getUrlParams("http://maps.google.de/maps?f=q&source=s_q&hl=de&geocode=&q=Frankfurt+am+Main&sll=50.106047,8.679886&sspn=0.370369,0.833588&ie=UTF8&ll=50.116616,8.680573&spn=0.35972,0.833588&z=11&iwloc=addr");

result 是一个对象:

{
  f: "q"
  geocode: ""
  hl: "de"
  ie: "UTF8"
  iwloc: "addr"
  ll: "50.116616,8.680573"
  q: "Frankfurt am Main"
  sll: "50.106047,8.679886"
  source: "s_q"
  spn: "0.35972,0.833588"
  sspn: "0.370369,0.833588"
  z: "11"
}

正则表达式分解如下:

(?:            # non-capturing group
  \?|&         #   "?" or "&"
  (?:amp;)?    #   (allow "&", for wrongly HTML-encoded URLs)
)              # end non-capturing group
(              # group 1
  [^=&#]+      #   any character except "=", "&" or "#"; at least once
)              # end group 1 - this will be the parameter's name
(?:            # non-capturing group
  =?           #   an "=", optional
  (            #   group 2
    [^&#]*     #     any character except "&" or "#"; any number of times
  )            #   end group 2 - this will be the parameter's value
)              # end non-capturing group
2020-05-01