How to replace every second or even space in a string with ";"?

Question

JavaScript

Tell me how to solve the question in the title, what regular expression to use?

Answer 1

'1 2 3 4 5 6 7 8 9 0'.replace(/([^ ]+ [^ ]+) /g, '$1;') // "1 2;3 4;5 6;7 8;9 0"