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POParsing CSV files with multiple formats in C# using regex
 

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  1. POParsing CSV files with multiple formats in C# using regex
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    <p>I have been trying to pass a csv file with three fields. The first two fields are simple and are easily extracted, the problem is with third field which is a string in nature hence can contain special characters including the ',' it self which is used to delimit the fields. I tried containing the string field between two ' " '(double quotes). But my requirement is that for simple string(without special characters) can exist without double quotes. I need to handle the next line in the string also. Below is a sample of a csv file.</p> <blockquote> <p>123,true,This is a memo</p> <p>234,false,"This is also a memo"</p> <p>345,true,</p> <p>456,true,Above me is a blank memo</p> <p>567,false,"This has a ,</p> <p>in it"</p> <p>678,true,This has a , in it &lt;--- This record should be rejected</p> <p>789,false,""</p> <p>890,true,Above me is also a valid blank memo</p> </blockquote> <p>I also found a good tool for testing the regex format string at <a href="http://derekslager.com/blog/posts/2007/09/a-better-dotnet-regular-expression-tester.ashx" rel="nofollow">http://derekslager.com/blog/posts/2007/09/a-better-dotnet-regular-expression-tester.ashx</a></p> <p>Till now I have used the following format string ^(""(?:[^""]|"""")<em>""|[^,]</em>),(""(?:[^""]|"""")<em>""|[^,]</em>)$</p> <p>The problem with this format string is that it does not handle multiple lines and does not reject a string with a starting double quote but missing ending double quote.</p> <p>Thanks in advance.</p> <hr> <p>Thanks for the help guys but I needed to parse custom data in CSV and had to create my own custom parser. I am parsing each and every field separately and using regex string in small chunks.</p>
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    1. USRajat Saini
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    1. CO[Stop Rolling Your Own CSV Parser!](http://secretgeek.net/csv_trouble.asp)
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      1. USReniuz
 

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