Keep the separators when splitting a string in JavaScript

The split() function in JavaScript splits a string into an array by a separator and removes the separator:

// Split by "-"
"hello-from-javascript".split("-");
// Result: ["hello", "from", "javascript"]

// Split by "-" or "_"
"hello-from_javascript".split(/-|_/g);
// Result: ["hello", "from", "javascript"]

Use a RegEx group (...) if you want to keep the separator in the array:

// Split by "-" or "_"
"hello-from_javascript".split(/(-|_)/g);
// Result: ["hello", "-", "from", "_", "javascript"]