JSFiddle - React, Tailwind, and code Playground

JavaScript

var str = "This is a long string with some numbers [125.000,55 and 140.000] and an end. This is another sentence.";
var sentences = str.replace(/\.\s+/g,'.|').replace(/\?\s/g,'?|').replace(/\!\s/g,'!|').split("|");
console.log(sentences[0]);
console.log(sentences[1]);