codex-lv3-may-2025

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Level 30: Refactor - Using Regex

Now we have a lot of replaceAll() calls! We can simplify this using a regular expression (regex) to match multiple characters at once.

A regex lets us match a pattern of characters. We can use square brackets [] to match any of the characters inside:

export function toSnakeCase(text) {
  return text.replaceAll(' ', '_').replaceAll(/[!?,]/g, '_').toLowerCase();
}

What does this regex do?

• /[!?,]/g is a regular expression pattern with the global flag
• The square brackets [] mean “match any of these characters”
• !?, means match exclamation marks, question marks, or commas
• The forward slashes / mark the start and end of the regex pattern
• The g flag makes the regex global so replaceAll() can replace every match

Try it now: Update your function with this regex and run your tests. They should all still pass (green)!

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