Replace all occurrences of the Tab character within double quotes

by

Match the double quoted substrings with a mere "[^"]+" regex (if there are no escape sequences to account for) and replace the tabs inside the matches only inside a match evaluator:

var str = "A tab\there \"inside\ta\tdouble-quoted\tsubstring\" some\there";
var pattern = "\"[^\"]+\""; // A pattern to match a double quoted substring with no escape sequences
var result = Regex.Replace(str, pattern, m => 
        m.Value.Replace("\t", "-")); // Replace the tabs inside double quotes with -
Console.WriteLine(result);
// => A tab here "inside-a-double-quoted-substring" some    here

See the C# demo

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