old string: skjdfhkjshd kjhsdkf khsdfkh <strong>sdfsdf</strong> ahsdga55 <?xml xml stuff here ?> blah55 kfhkhdfksf akjhdads <br><br>new string: skjdfhkjshd kjhsdkf khsdfkh <strong>sdfsdf</strong> ahsdga55  blah55 kfhkhdfksf akjhdads <br><br>