Javascript正则表达式在括号中提取

Question

I am working with some html that is created at runtime, where I need to get text using regex in Javascript. The html has an edit box that contains some text, and an image tag that looks like this:

<img src="http://server/directory/subdirectory/Images1/logo_aa.png" alt=" logo_ce" data-tag=" [[image: logo_aa]] ">

I need to be able to extract the "[[image: logo_aa]]" portion out, and then replace the whole html image tag with it. But or some reason, regex only gets "a]" when I run it. Here is an example of the code that I am using:

var imgHtmlPattern = new RegExp("<img[^>]*?>", "g");
var imageTagPattern = new RegExp("\[\[Image:\s\S+\]\]", "i");

var str = 'A whole paragraph of text here. <img src="http://server/directory/subdirectory/Images1/logo_aa.png" alt=" logo_ce" data-tag=" [[image: logo_aa]] ">';

var matches = str.match(imgHtmlPattern);

for (i = 0; i < matches.length; i++) {

    var test = imageTagPattern.exec(matches[i]);
    alert(test);

    //  var tag = matches[i].match(imageTagPattern);
    //  alert(tag);
}

var imageTagPattern = new RegExp("[[Image:\\s\\S+]]", "i");

Debuggex Demo

Answer 1

You need to use double \\\\ for RegExp object creation:

var imageTagPattern = new RegExp("\\[\\[Image:\\s\\S+\\]\\]", "i");

Or just use regex literal:

var imageTagPattern = /\[\[Image:\s\S+\]\]/i;