You didn't mention how long the string is supposed to be or how many characters are possible at each position in the string; obviously these points would have an impact on the practicality of the process.
In any case, I think you're mistaken about preferring the use of hashes. Unless I misunderstood your post, the app you're talking about is just a matter of nested loops, one loop for each character position in the string. The inner-most loop prints the concatenation of all the loop iterators. The number of iterations on each loop is simply the number of possible characters to use at the corresponding position. It could be structured recursively to support handling strings of various lengths. But using hashes would be a waste of time, and a vast waste of memory.
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.