Regular expression to allow alphanumeric, max one space etc

Question

I\'m opening this thread that is really similar to another one but I cannot figure out an issue : I have an input field that allow a alphanumeric string with an optional unique

Answer 1

This is a simpler regex using \w (word class):

^([\w]+(\s*))$

Test

It's instantaneous in JavaSript

var input = "dzdff5464zdiophjazdioj ttttttttt zoddzdffdziophjazdioj ttttttttt  zoddzdffdzdff ttttt zoddzdfff ttttt zoddzdfff ttttt zoddzdfff ttttt  zoddzdfff ttttt zoddzdfff ttttt zoddzdfff ttttt zoddzdfff ttttt  zoddzdfff ttttt zo999  ddzdfff ttttt zoddzdfff ttttt zoddzdff";

var re = /([\w]+(\s*))/g;

console.log(input.replace(re, "boo"));