Validating currency with symbols and letters

Question

Hello I have a basic bot that asks a user how much money they currently have, the bot then takes the response and gives it back. Currently I am using Amazon's built in slot type AMAZON.Number. As an example:

* bot - How much money do you have?
* user - $250
* (bot doesn't understand and re-asks the same question)
* bot - How much money do you have?
* user - 2k
* (bot doesn't understand and re-asks the same question)
* bot - How much money do you have?
* user - 2000
* bot - great, you have $2000.00

is there anyway to validate the number so that I can pass symbols such as the US dollar sign "$" and the number K, so that 3k is "$3000"?

Basically the bot is not registering the "$" and "k" as valid input.

Sedat Salman · Accepted Answer

you can use a lambda function as a custom slot this function can modify the user input according to your requirements

for example you can complete the following

```
exports.handler = (event, context, callback) => {
    var userMoney = event.currentIntent.slots.Currency; // get the user's response
    userMoney = userMoney.replace('$', ''); // remove dollar sign
    userMoney = userMoney.replace('k', '000'); // replace 'k' with '000'
    userMoney = parseFloat(userMoney); // convert the result to a number

if (isNaN(userMoney)) {
```

Gary Mclean · Answer

Im not a developer but how about using a regex expression to only return numbers and ignore anything else

```
/\d+.\d+
```

Or use AMAZON.AlphaNumeric using a regular expression which allows you to define a validation

Validating currency with symbols and letters

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