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fix(curriculum): clarify instructions for calorie counter project step 31 by adding a code example (#53578)

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curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/learn-form-validation-by-building-a-calorie-counter/63bf5a518d54f63181ab639a.md
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@ -7,7 +7,15 @@ dashedName: step-31
# --description--
The `e` in a number input can also be an uppercase `E`. Regex has a flag for this, however – the `i` flag, which stands for "insensitive". This flag makes your pattern case-insensitive. Add the `i` flag to your regex pattern.
The `e` in a number input can also be an uppercase `E`. Regex has a flag for this, however – the `i` flag, which stands for "insensitive".
```js
/Hello/i
```
The following regex would match `hello`, `Hello`, `HELLO`, and even `hElLo` because of the `i` flag. This flag makes your pattern case-insensitive.
Add the `i` flag to your regex pattern.
# --hints--