function Parse($text)
{
    list($text) = explode('@',$text);
    $text = PReg_replace('/[^a-z0-9]/i',' ',$text);
    $text = ucwords($text);
    return $text;
}

对于您输入的some_email@yahoo.com,它会输出“Some Email”

实况动作http://codepad.org/w0yfRFbo