JavaScript and regular expression, only numbers and . ,
Regular expressions is not my thing. Hope you can help me here. 

I have this right now:

/^[0-9]+$/

and i need to change it, so it will allow numbers from 0-9 and only "," to be in the string 1 time. After the , we can only have as many digits we want but only 2 digits before the ",".

allowed: 66,6666 - 6,66 - 6,6
Not allowed: 666,66 - 66,666abc - abc,666

Hope you can help. 
JavaScript and regular expression, only numbers and . ,
===

Regular expressions is not my thing. Hope you can help me here. 

I have this right now:

/^[0-9]+$/

and i need to change it, so it will allow numbers from 0-9 and only "," to be in the string 1 time. After the , we can only have as many digits we want but only 2 digits before the ",".

allowed: 66,6666 - 6,66 - 6,6
Not allowed: 666,66 - 66,666abc - abc,666

Hope you can help. 