regex - Detect if string is number or has decimal value in javascript -

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i need users enter amount , may come in different formats 500 or 500.00. need check if user has entered number or number 2 decimal points. far have tried 

if(/^\d+$/.test(amount) === false || /[0-9]+(\.[0-9][0-9]?)?/.test(amount) === false){           //valid }else{          //invalid }

but far 1 check if number working fine.

i guess looking this

var pattern=/^\d+(\.\d{2})?$/; if(pattern.test(amount)) {           //valid number pattern } else {          //invalid number pattern }

\d+(\.\d{2})?$ match 1 many digits optionally followed 2 decimal values..


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