JSFiddle - React, Tailwind, and code Playground

by radu

JavaScript

function isValid(temp) {
    var reg0str = "^-?([0-9]{0,3}$|[0-9]{0,2}\.?[0-9]{0,1}$)",
        reg0 = new RegExp(reg0str);
    if (reg0.test(temp)) return true;
}

console.log(
    isValid(1), 
    isValid(12),
    isValid(123),
    isValid(1234)
);