codex-lv3-may-2025

Level Navigation: 1

Level 33: Using \W for All Non-Word Characters

If we want to replace ALL punctuation (not just specific ones), we can use \W which matches any non-word character:

export function toSnakeCase(text) {
  return text.replaceAll(' ', '_').replaceAll(/\W/g, '_').toLowerCase();
}

What does \W do?

\W matches any non-word character (punctuation, symbols, etc.)
It does NOT match letters, numbers, or underscores
This is a shorthand for “everything except word characters”
Mnemonic: lowercase \w stands for word characters; uppercase \W flips the meaning to non-word characters.
The g flag makes the regex global so every non-word character gets replaced

Try it: Update your function and run your tests. They should still pass!