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c# - Replace whitespace outside quotes using regular expression

Using C#, I need to prepare a search text for searching in a SQL Server database using the LIKE command by replacing all whitespace outside quotes with a % character. Example:

Input:

my "search text"

Output:

%my%search text%

Any help would be appreciated. I can handle input strings with an odd number of quotes before replacing the text.

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Instead of using a RegEx, use a simple state machine - loop over each character, noting whether you are "in" or "out" of quotes and only replace spaces when you are in the "out" state.


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