Function to insert to text a random char
<p>I need to write a function which will find in a string limits <code>[insert - l] some text [/insert]</code> and put into each word a char specified in a limit (in example char l )
I think that I need to find all between [insert - l] [/insert] split it to array and put a char into each word in a random position, but my knowlogde isn't enough to write it. PLease help me=\</p>

<p>Example:</p>

<pre><code>Musgrave was [insert - l] selected as a scientist-astronaut [/insert] by NASA in August 1967. 
</code></pre>

<p>After function I have to get:</p>

<pre><code>Musgrave was sellected als a scilentist-astrlonaut by NASA in August 1967.
</code></pre>
