JSFiddle - React, Tailwind, and code Playground

HTML

<span id="result"></span>

JavaScript

var Str = "blablabla22445543__-_-_-_-_-_-èèpzofez5zsqef*f-e+ffnfuf'3";

var nomDoc = Str.replace(/[^0-9]/g, "");

$("#result").html(nomDoc);