Thanks Monks, for your excellent responses.

I am glad to see 'amazing ideas. I am in the process of running your code against different patterns.
Meanwhile test your code against:

String: bookhelloworldhellohellohihellohiworldhihelloworldhihellobookpenbookpenworld

Number of Patterns:5
==========================================================
Deduce patterns:world pen, book, hi, hello

Some more rules to identify patterns.

1.  I am not looking specifically for dictionary words. 
2.  One Pattern cannot be part of another pattern.
3.  There could be multiple answers.
4.  A Pattern may  show up only once.
5.  A Pattern may contain single character only
6.  A Pattern may contain space also.

In case of multiple answer there could be 'techniques' we can apply to obtain the possible best
such as: minimum sum of length of patterns.

Thanks,
Artist.

---

---

• 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> <u> <ul>

• 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 intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.