Can specify the upper and lower number of patterns with quantity specifiers, used with curly brackets { } Put two numbers in between
let A4 = "aaaah";
let A2 = "aah";
let multipleA = /a{3,5}h/; // matches only if a occurs between 3 and 5 times
multipleA.test(A4); // returns true
multipleA.test(A2); // returns false
// specify only lower number of matches
let multipleA2 = /a{2,}h/;
// specify exact number of matches
let exact = /a{2}/;