RegExpr to Add Comma and Decimal Points

[Alec Lee]

I am playing around with regular expressions and want to see if I can use it to add commas and decimal point to my money input field in the most concise way. However, I can only achieve adding a single comma and decimal point with a single line:

var formatedValue=this.value.replace(/^(\d{1,3})((\d\d\d)*)(\d\d)$/,"$1,$2.$4");
 
//  123456789 => 1,234567.89

Does regular expressions provide any other facilities to add the remaining commas?