Regular expression to check non-escaped charcters
<p>Many characters, like ellipses, quotation marks, long hyphens, apostraphes, superscript, and subscript will all be encoded incorrectly as boxes and strange text characters when we are submitting the web page.We need to make a regex expression which will check for these characters.</p>

<p>Actully when we would submit things like quotation marks, or ellipses, or bullet points, they would show up as a big square on the web page  or they would be escaped out and be a string of control characters, like $&amp;&amp;$.
so, we want to find or check for those squares, control sequences, and other strange unicode character types.</p>

<p>so we need  regular expression that check all these. Or is there any other way or approach that we should follow.</p>
