How to get multiple copied texts lines using intellij api or java code.

Hello all,

I'm developing a plugin that get multiple copied text lines to get declaried variables and paste it into tuple form with some filteration using regex.

like, 

name = "Harshdeep"

age = 24

company = "XYZ"

username = "harshdeep007"

now I just copied all above code and I want to paste just variables as a tuple like,

fields = [ 'name', 'age', 'company', 'username' ]

I've doveloped a working prototype of this plugin.

but, got problem when I select the multiple lines with alt key. It paste only last selected line's variable.

example, 

I've selected whole ( name and company line ) from above given code.

Now, I got only tuple like, fields = [ 'company' ]

How to solve it..???

My code.

public class pycCopyDjangoModelFields extends AnAction {

    @Override
    public void actionPerformed(@NotNull final AnActionEvent e) {
        StringBuilder fields = new StringBuilder();
        Editor editor = e.getRequiredData(com.intellij.openapi.actionSystem.CommonDataKeys.EDITOR);
        String SelectModel = editor.getSelectionModel().getSelectedText();
        String regex = "(\\S+)\\s*=\\s*[^(]*\\(([^)]*)\\)";
        Pattern pattern = Pattern.compile(regex);

        if (SelectModel == null) {
            return;
        }

        Matcher m = pattern.matcher(SelectModel);
        boolean first = true;
        while (m.find()) {
            if (first) {
                fields.append("fields = [ ");
                first = false;
            }
            fields.append("'");
            fields.append(m.group(1));
            fields.append("', ");
        }
        if (!first) {
            fields.append("]");
        }
        CopyPasteManager.getInstance().setContents(new StringSelection(fields.toString()));
    }
}