Fix TinyMCE &nbsp chars, leaving those without a space in front intact

TextareaStripNbsp.module

<?php

/**
 * TinyMCE replace nbsp with regular whitespace
 *
 * Only nbsp preceeded with a whitespace will get replaced, this leaves
 * single non breaking space only bewtween words
 *
 * ProcessWire 2.x
 * Copyright (C) 2012 by Ryan Cramer
 * Licensed under GNU/GPL v2, see LICENSE.TXT
 *
 * http://www.processwire.com
 * http://www.ryancramer.com
 *
 */

class TextareaStripNbsp extends WireData implements Module{

    public static function getModuleInfo() {
        return array(
            'title' => 'Unicode &nbsp (x00a0) Stripper',
            'version' => 100,
            'summary' => "Replaces the Unicode non-breaking space character /\s\x{00a0}/u with a regular space for all InputfieldTinyMCE when saving.",
            'autoload' => true
        );
    }

    public function init(){
        $this->addHookAfter('InputfieldTinyMCE::processInput', $this, 'hookFixNBSP');
    }

    public function hookFixNBSP(HookEvent $event){
        $value = $event->object->value;
        // replace only nbsp with a preceeding space
        // this ensures nbsp to not wrap words still works
        $value = trim( preg_replace('/\s\x{00a0}/siu', " ", $value) );
        $event->object->value = $value;
    }
}