如何使用C＃和正则表达式删除引号（“）内的所有逗号

Question

How to build a regex to remove all commas that are inside quotes(") using C# and then substitute them by @?

Example :

Initial string like this = (value 1,value 2,"value3,value4,value5",value 6)

Expected string like this = (value 1,value 2,"value3@value4@value5", value 6)

Answer 1

You can use

string input = "(value 1,value 2,\"value3,value4,value5\",value 6)";
var regex = new Regex("\\\"(.*?)\\\"");
var output = regex.Replace(input, m => m.Value.Replace(',','@'));

Answer 2

string input = "= (value 1,value 2,\"value3,value4,value5\",value 6)";
string pattern = "(?<=\".*),(?=.*\")";
string result = Regex.Replace(input, pattern, "@");

Answer 3

Regex pattern referred below would work to identify data within double quotes even in multiple level Regex pattern: ([\\"].*[\\"])

        List<string> input = new List<string>();
        input.Add("= (value 1,value 2,\"value3,value4,value5\",value 6)");
        input.Add("\"(value 1,value 2,\"value 3, value 4\",value 5,value 6)\"");
        var regex = new Regex("([\"].*[\"])");

        List<string> output = input.Select(data => regex.Replace(data, m=> m.Value.Replace(',','@'))).ToList();

        foreach(string dat in output)
            Console.WriteLine(dat);