Question

How to check a string is numeric positive and possibly a comma as decimal separator and two decimal places maximum.

Example

10.25 is true
10.2 is true
10.236 is false theres 3 decimal
10.dee is false

Answer 1

or you can use this regexp

^[0-9]*([,]{1}[0-9]{0,2}){0,1}$

if you want both comma and dot as allowed separator then

^[0-9]*([\.,]{1}[0-9]{0,2}){0,1}$