Javascript-string.split(regex)保留分隔符 [英] Javascript - string.split(regex) keep separators

问题描述

我想使用正则表达式拆分字符串，并在结果数组中包含分隔符/匹配的信息.

I would like to split a string using a regular expression and have the separators / matched info included in the resulting array.

在Java中，我使用了:

In java I used:

theString.split("(?<=[!><=}{])|(?=[!><=}{])|(?<= AND )|(?= AND )|(?<= OR )|(?= OR )")

但是，javascript不支持向后隐藏?< =

But, javascript doesn't support lookbehind ?<=

例如，我想要字符串:

"Reason={Existing problem or fault}{Bestaande probleem of vout}{Other}{Ander} and Required!=No and Results >=10 and Results <=25 and Tst>5 and Tst<80 and Info=test this or that and those and Success!=Yes"

要拆分:

Reason,=,{,Existing problem, or ,fault,},{,Bestaande probleem of vout,},{,Other,},{,Ander,}, and ,Required,!,=,No, and ,Results,>,=,10, and ,Results,<,=,25, and ,Tst,>,5, and ,Tst,<,80, and ,Info,=,test this, or ,that, and ,those, and ,Success,!,=,Yes

我所拥有的例子:

var thestr = "Reason={Existing problem or fault}{Bestaande probleem of vout}{Other}{Ander} and Required!=No and Results >=10 and Results <=25 and Tst>5 and Tst<80 and Info=test this or that and those and Success!=Yes";

document.write("::SPLIT::<br>");
var patt1=new RegExp(/([!><=}{])|( AND )|( OR ) /gi);

var x = thestr.split(patt1);
//This splits correctly but, doesn't include the separators / matched characters
document.write("length="+x.length+"<br>");
for (c=0;c<x.length;c++) {
    document.write(c+" - "+ x[c]+" |");
}

document.write("<br><br>::MATCH::<br>");

var y = thestr.match(patt1);

//This shows the matched characters but, how do I combine info from split and match
document.write("length="+y.length+"<br>");
for (d=0;d<y.length;d++) {
    document.write(d+" - "+ y[d]+" |");
}

document.write("<br><br>::INCLUDE SEPERATORS::<br>");
var patt2=new RegExp(/(?![!><=}{])|(?=[!><=}{])|(?! AND )|(?= AND )|(?! OR )|(?= OR ) /gi);
//This puts everything in the array, but, each character is a seperate array element.
// Not what I wanted to achieve.
var bits = thestr.split(patt2);
document.write("length="+bits.length+"<br>");
for (r=0;r<bits.length;r++) {
    document.write(r+" - "+ bits[r]+" |");
}

推荐答案

如果将整个模式放在一个组中，您还将获得分隔符:

If you put the whole pattern in a group, you will also get the separators:

thestr.split(/([!><=}{]| (?:AND|OR) )/)

这将返回一个数组，如:

This returns an array like:

["Reason", "=", "", "{", "Existing problem or fault", "}", "", "{", "Bestaande probleem of vout", "}", "", "{", "Other", "}", "", "{", "Ander", "}", " and Required", "!", "", "=", "No and Results ", ">", "", "=", "10 and Results ", "<", "", "=", "25 and Tst", ">", "5 and Tst", "<", "80 and Info", "=", "test this or that and those and Success", "!", "", "=", "Yes"]

然后，您只需要过滤空字符串就可以了:

Then you just need to filter the empty strings and you’re done:

thestr.split(/([!><=}{]| (?:AND|OR) )/).filter(Boolean)

---

编辑由于Internet Explorer和可能的其他浏览器未将分组分隔符带入结果数组，因此您可以这样做:

---

Edit    Since Internet Explorer and possibly other browsers do not take a grouped separator into the result array, you could do this instead:

var matches = thestr.split(/(?:[!><=}{]| (?:AND|OR) )/),
    separators = thestr.match(/(?:[!><=}{]| (?:AND|OR) )/g);
for (var i=0; i<separators.length; ++i) {
    matches[i+1] = separators[i];
}

这基本上将分隔符与其他部分分开，然后将两者组合.

This basically separates the separators from the other parts and then combines both.

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