Replacing colored Text in QTextEdit

Question

I hope doing good I am facing an issue with changing the color of only searched string from a file in QTextEdit and I have used replace method with "colored" module but I am not getting colored string, in console window I am getting colored string of selected one but in "QTextEdit" I am getting this before searching I am getting this

Here I need to change the color of only searched word.

Here is my code `

with open(self.new_path, 'r') as f2:
            for line in f2:
                if re.findall(tex, line):
                    color = colored(tex, 'blue', attrs=())
                    line = line.replace(tex, color)
                self.w.append(line)
        self.sub.setWidget(self.w)
        self.sub.setWindowTitle('Sabrefiles'+" "+str(treewid.count))
        self.mdiArea.addSubWindow(self.sub)
        self.sub.show()

`