I have a regex for only numbers allowed. But need one for floating o's als : I have a regex for to check if an input field has only numbers in it. 

    if (paymentAmount.match(/[^0-9\.,]/g)) ... show error

I need to also check for if there are any 0's before the value also. 
for example. 0001.23 should throw and error. but 1.23 should be ok. 
Is there a way to add this to the current regex check. 
 