Learn Form Validation by Building a Calorie Counter - Step 23

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Step 23

While looping through the string works, creating a new array is inefficient for memory and runtime performance. Instead, you can use Regular Expressions (referred to as “regex”) to match specific characters.

Regex in JavaScript is indicated by a pattern wrapped in forward slashes – for example:

const regex = /hello/;

Remove your existing code within the cleanInputString function. Declare a regex variable and assign it the value from the example above.

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Learn Form Validation by Building a Calorie Counter - Step 23

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Delete everything inside the function call, and then copy the regex assignment from the instructions.

const regex = /hello/;