使用正则表达式和Javascript从字符串中提取值

Question

Given a string like:

</gd:organization><gd:email rel='http://schemas.google.com/g/2005#other' address='CM@Aart.com'/><gd:email rel='http://schemas.google.com/g/2005#other' address='da@ammeart.com' primary='true'/><gd:phoneNumber rel='http://schemas.google.com/g/2005#work'>011 360 51 60</gd:phoneNumber>

I need to remove from the string:

<gd:email rel='http://schemas.google.com/g/2005#other' address='CM@Aart.com'/>

- based on a match to: CM@Aart.com .

It has to be done in basic JavaScript and I can't import any special parsing tools. I can't seem to find a combination that does not error out.

Thank you!

Answer 1

This is simple enough, do tell if you need any changes:

var inputString = "</gd:organization><gd:email rel='http://schemas.google.com/g/2005#other' address='CM@Aart.com'/><gd:email rel='http://schemas.google.com/g/2005#other' address='da@ammeart.com' primary='true'/><gd:phoneNumber rel='http://schemas.google.com/g/2005#work'>011 360 51 60</gd:phoneNumber>";
var outputString = inputString.split("CM@Aart.com")[1].substring(3);
alert(outputString);

I've posted a JSFiddle for it.

Answer 2

If this must be done in RegExp, you could attempt something like the following only if you know that all <gd:email> parts will have an address attribute, quotes are ' and end /> without address=' or /> appearing inside any values on those attributes.

"</gd:organization><gd:email rel='http://schemas.google.com/g/2005#other' address='CM@Aart.com'/><gd:email rel='http://schemas.google.com/g/2005#other' address='da@ammeart.com' primary='true'/><gd:phoneNumber rel='http://schemas.google.com/g/2005#work'>011 360 51 60</gd:phoneNumber>"
.replace(
    /<gd:email .*?address='([^']*)'.*?\/>/g, // match email node
    function (a, b) { // replacement logic
        if (b === 'CM@Aart.com') return '';
        return a;
    }
);

As I said in my comment , the best way to achieve this would actually be with DOMParser which is a native JavaScript XML parser, but the string you have given us is not valid XML as it begins with a close tag.