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PORegex creation based upon input
 

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    <p>I have a web application, written in PHP that incorporates Javascript and JQuery, that will be used as my company's Inventory Management System (IMS). What I would like to be able to create is a Regex expression based upon user input of a value.</p> <p>The idea behind this is that most manufacturers' serial numbers schema, length of characters and mixture of alpha to numeric values, is unique to a certain part. So when a part is added to the IMS and the first serial number is scanned into the system I would like a Regex statement to be built and saved to a database table corresponding to that part type. Any future times that a serial number is scanned the part should be auto-selected as the part type as it matches the serial number schema for that manufacturer. I understand this methodology may not always hold true to a single part so I could even return a list of parts that match the schema instead of the user needing to look it up in the catalog.</p> <p>The basis of my question is what is the best starting point to look at having a function in code be able to decipher a value given by a user to create a Regex expression? I'm not requesting a full function but a starting point of how to look at my situation and goal so I can understand where to begin. I've scratched my head long enough and starting writing functions numerous times just to delete the entire block knowing I was headed for disaster.</p> <p>Anything in code is possible - is this feasible? </p> <hr> <p><strong>EDIT - ADDED SAMPLE VALUES</strong></p> <p>DVD-RW (Optical Drives)</p> <ul> <li>1613518L121</li> <li>1613509L121</li> <li>1613519L121</li> </ul> <p>VGA Output Cards</p> <ul> <li>0324311071068</li> <li>0324311071134</li> </ul> <p>COM Expansion Cards</p> <ul> <li>608131234</li> <li>608131237</li> </ul> <p>Hard Drives</p> <ul> <li>WMAYUJ753738</li> <li>WMAYUJ072099</li> <li>WMAYUJ683739</li> <li>WMAYUJ844900</li> </ul> <p>As you can see some values are going to be numeric only of a certain length of characters. Others will have alpha characters at the beginning followed by a series of numbers. Others may have alpha/numeric characters interspersed with each other. In most every single case a simple length of alpha/numeric rule is going to fit for identifying a singular part type in our list of goods. However, in those cases that more than one expression matches a value, I can simply have the application show a list of two or more products that match the regex and prompt the user to select the proper part. This, overall, will save time and mistakes in selecting a product type in the WMS database.</p> <p>Thanks for the comments. I understand I'm not asking a question that has one answer to it. I'm looking for a starting point on how to best step through the string and spit out a corresponding Regex statement that would match the value.</p>
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    1. COI don't think you can do it. You can't make a rule based on one example. That's my opinion, anyway.
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    2. COPete, in you opinion, how many samples would one need in order to create a valid expression? Or are you suggesting that the entire idea itself is not valid?
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    3. COAh. That's a different thing altogether. It would be a bit like cracking codes, wouldn't it? The danger, as I see it, is that you make a rule based on X cases and then chuck back a load of data because the rule is flawed in some way.
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