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HTML

console.log(regex.test("2.2")) ;

JavaScript

var regex = /^[0-9]{1,2}.?[0-9]{1,2}$/;
console.log(regex.test("2.2")) ;//true
console.log(regex.test("22.2")) ;//true

console.log(regex.test("123.2")); //true
console.log(regex.test("2.122")) ;//true

console.log(regex.test("2.22")) ;//false
console.log(regex.test("22.22")) ;//false

console.log(regex.test("22.123")) ; //false
console.log(regex.test("122.")); //false
console.log(regex.test(".22")); //false

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JSFiddle - React, Tailwind, and code Playground

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Use pre-released features

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