javascript - Correct way of handling multiple housenumber options possible regex

Question

I'm looking for help refactoring this messy code part. It should handle the following house number formats

• 54 6 K 1 -> 546 K 1
• 54 6k 1 -> 546 K 1
• 20 H L -> 20 H L
• 1 10 -> 1 10
• 546 k1 -> 546 K 1
• 1K -> 1 K

    ?.toUpperCase()
    ?.match(/[^a-z]+|[a-z]|[a-z]/gi)
    ?.map((part) => `${part.trim()} `) // Split each part with a space
    .toString() // Revert to one string
    .replace(/,/g, "") // Remove all commas
    .replace(/s+/g, " ") // Remove duplicate spaces
    .trim(); // Remove and spaces

Answer 1

You can use

function foo(input) {
  return !/[a-z]/i.test(input) ? input : input
    ?.toUpperCase()
    ?.match(/[^a-zs]+|[a-z]/gi)
    .join("") // Revert to one string
    .replace(/(?<=D)|(?=D)/g, ' '); // Add spaces before/after a non-digit
}

console.log(foo("54 6 K 1"));
console.log(foo("54 6k 1"));
console.log(foo("20 H L"));
console.log(foo("1 10"));
console.log(foo("546 k1"));
console.log(foo("1K"));