Python regular expressions
<p>Is there any regular expression to match this:</p>

<ul>
<li>a continuous string of characters or/and digits XOR</li>
<li>a string of any characters between a pairquotation marks (" XOR ')including nested quotations </li>
</ul>

<p>?</p>

<p>Examples:</p>

<ul>
<li>dgsdggsgggdggsggsd </li>
<li>'dsfsasf .asgafaasfafw rq' </li>
<li>"sadas fa fasfa "</li>
</ul>
