create regex from string code example

Example 1: les fonctions reguliere javascript

if(! pseudo.match(/^([a-zA-Z ]+)$/))
    alert('Pseudo invalide');

Example 2: using regex in javascript

//Adding '/' around regex
var regex = /\s/g;
//or using RegExp
var regex = new RegExp("\s", "g");

Example 3: console regex

console\.log\(([^)]+)\);