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Asked: 2026-06-12T11:28:09+00:00

I need a regex expression in C# which can remove any number of double

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I need a regex expression in C# which can remove any number of double quotes coming in my string, it is a csv file where after reading from StreamReader I want to replace all double quotes coming in my string. First row is header and second is data. For ex:

"E-mail","First Name","Last Name","Company"
"san@test.com","sanjay","sen","this is my "test" company"

So ideally regex should give following output :

"E-mail","First Name","Last Name","Company"
"san@test.com","sanjay","sen","this is my test company "

So double quotes removed from column "this is my "test" company" and resultant into "this is my test company"

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1 Answer

  1. Editorial Team

    You should try to fix the source of improperly escaped strings instead of mucking around with a regex. If you can’t do that and are desperate to get something done, one quick and dirty approach would be to remove quotes that don’t border on commas or start/end of string:

    resultString = Regex.Replace(subjectString, "(?<!,|^)\"(?!,|$)", "");

    This assumes that you’re handling one CSV row at a time. If you have the entire file in a single string, then use RegexOptions.Multiline as the third parameter.

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