How to prefix certain characters in a string with regex?

@haylee.mertz 

To prefix certain characters in a string using regex, you can use the String.prototype.replace() method in JavaScript. Here's an example of how you can achieve this:

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// Define the string that you want to update
let str = "Hello World!";

// Define the characters that you want to prefix
let charactersToPrefix = /[aeiou]/gi;

// Use the replace method with a regex pattern to prefix the specified characters
let updatedStr = str.replace(charactersToPrefix, 'X$&');

console.log(updatedStr); // Outputs: HXello WXorld!

In this example, the regex pattern [aeiou] matches any vowels in the string, and the $& in the replacement string is used to refer to the matched substring. The letter 'X' is added as a prefix to each matched vowel. You can modify the regex pattern and replacement string based on the specific characters you want to prefix in your string.