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//See:https://github.com/DanielEgan/botstarter/blob/master/app/recognizers/greeting.js
//Also: bot0

greeting.js

const greetings = [
    'hi',
    'hi there',
    'hey',
    'hey there',
    'hello',
    'hello hello',
    'hello there',
    'what up',
    'what\'s up',
    'whatup',
    'salute',
    'morning',
    'good morning',
    'how are you',
    'how r u'
];

module.exports = {
    recognize: function(context, callback) {
        const text = context.message.text.replace(/[!?,.\/\\\[\]\{\}\(\)]/g, '').toLowerCase();
        
        let isGreeting = greetings.some(g => text === g);

        let recognized = {
            entities: [],
            intent: (isGreeting ? 'greeting' : null),
            matched: undefined,
            expression: undefined,
            intents: [],
            score: (isGreeting ? 1 : 0)
        }

        callback.call(null, null, recognized);
    }
};


app.js

const greeting = require('./app/recognizers/greeting');     //A


var recognizerLuis = new builder.LuisRecognizer(process.env.LUIS_MODEL_URL);

var intents = new builder.IntentDialog({
    recognizers: [
        greeting,                                       //A
        ending,                                         //B
        smiles,                                         //C
        startup,                                        //D
        recognizerLuis                                  //LUIS
    ],
    intentThreshold: 0.2,
    recognizeOrder: builder.RecognizeOrder.series
});

intents.matches('Greeting', '/welcome');                //A


welcome.js

module.exports = function(bot) {
    bot.dialog('/welcome', [
        function (session, args, next) {
            const lastVisit = session.userData.lastVisit;

            session.send(['Hello!', 'Hi there!', 'Hi!']); //Choose one of the three
            session.send ('Good ' + amPm());
            if (!lastVisit) {
                session.send('It's a pleasure to meet you');
                session.userData = Object.assign({}, session.userData, {
                    lastVisit: new Date()
                });
                session.save();
            } else {
                session.send('Glad you\'re back!');
            }

            session.endDialog('How can I help you?');
        }
    ]);
};