Find a char or substring with specifying start pos
<p>I couldn't find a function which would let me specify the start pos for beginning a char or substring search.</p>

<p>I have, for example:</p>

<pre><code>char *c = "S1S2*S3*S4";
</code></pre>

<p>I'd like search for '<code>S3</code>' by searching the first '<code>*</code>' asterisk and then the second asterisk following it and finally getting the substring '<code>S3</code>' enclosed by those asterisks. </p>
