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copied!<p>Seems you want to create something like regular expression out of set of example strings. This might be quite tricki in general. Found this link, not sure if it's relevant: <a href="http://scholar.google.com/scholar?hl=en&rlz=1B3GGGL_enEE351EE351&q=%22regular%20expression%20by%20example%22&oq=&um=1&ie=UTF-8&sa=N&tab=ws%0A" rel="nofollow noreferrer"><a href="http://scholar.google.com/scholar?hl=en&rlz=1B3GGGL_enEE351EE351&q=%22regular%20expression%20by%20example%22&oq=&um=1&ie=UTF-8&sa=N&tab=ws" rel="nofollow noreferrer">http://scholar.google.com/scholar?hl=en&rlz=1B3GGGL_enEE351EE351&q=%22regular%20expression%20by%20example%22&oq=&um=1&ie=UTF-8&sa=N&tab=ws</a></a></p> <p>On the other hand, if you need only one specific wildcard meaning "0 or more characters", then it should be much easier. <a href="http://en.wikipedia.org/wiki/Levenshtein_distance" rel="nofollow noreferrer">Levenshtein distance</a> algorithm computes similarity between 2 strings. Normally only result is needed, but in your case the places of differences are important. You also need to adapt this for N strings.</p> <p>So I recommend to study this algorithm and hopefully you'll get some ideas how to solve your problem (at least you'll get some practice with text algorithms and dynamic programming).</p> <p>Heres algorithm in PHP: _http://en.wikibooks.org/wiki/Algorithm_Implementation/Strings/Levenshtein_distance#PHP</p> <p>You might want also to search for PHP implementations of "diff". <a href="http://paulbutler.org/archives/a-simple-diff-algorithm-in-php/" rel="nofollow noreferrer">http://paulbutler.org/archives/a-simple-diff-algorithm-in-php/</a></p>

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