Javascript & JQuery & CSS

str1		= "-123456.789";
str2		= "12,345.789";

alert(comma(str1));
alert(uncomma(str2));
//콤마찍기
function comma(str) {
    str = String(str);
    return str.replace(/(\d)(?=(?:\d{3})+(?!\d))/g, '$1,');
}

//콤마풀기
function uncomma(str) {
    str = String(str);
    return str.replace(/[^\d]+/g, '');
}