sfApexClass

public class ReplaceSpecialCharactersWithDashes {
    // Define a class to handle input
    public class Request {
        @InvocableVariable(label='Input Text' description='Text to process')
        public String inputText;
    }

    // Define a class to handle output
    public class Response {
        @InvocableVariable(label='Processed Text')
        public String outputText;
    }

    // Invocable method to replace special characters
    @InvocableMethod(label='Replace Special Characters' description='Replaces all special characters except hyphens with a hyphen in the given text.')
    public static List<Response> replaceSpecialChars(List<Request> requests) {
        List<Response> responses = new List<Response>();
        for (Request request : requests) {
            Response response = new Response();
            // Check if inputText is null before replacing characters
            if (request.inputText != null) {
                response.outputText = request.inputText.replaceAll('[^a-zA-Z0-9-]', '-');
            } else {
                response.outputText = null; // Explicitly set to null if inputText is null
            }
            responses.add(response);
        }
        return responses;
    }
}