var pattern = /(^(\d|[1-9]\d)(\.\d{1,2})?$)|(^100$)/,
str0 = '0', //true
str1 = '0.1', //true
str2 = '66', //true
str3 = '66.6', //true
str4 = '100', //true
str5 = '101', //false
str6 = '-101'; //false
console.log(pattern.test(str));
