JSFiddle - React, Tailwind, and code Playground

JavaScript

var episodePatternGI = /s(\d{1,2})e(\d{1,2})/gi;
var matches = 'S3E1 hehehe bla s09e12'.match(episodePatternGI);
var episodes = [];

var episodePatternI = /s(\d{1,2})e(\d{1,2})/i; // g modifier removed

matches.forEach(function(val) {
	var ep = episodePatternI.exec(val); // New pattern applied
	episodes.push({
  	s: ep[1],
   	e: ep[2]
  });
});

console.log(episodes);