Want only one or|two digits number before the decimal point in textfield flutter. And User can't add more than three digits after the decimal point

Question

Only one or two digits number before the decimal point in texfFormField flutter. And User can't add more than three digits after the decimal point.

Answer 1

If your String what the user typed is called value:

List<String> split = value.split('.');
if (split.elementAt(0).length > 2 || split.elementAt(1).length > 3) print('Not valid'); 

If you need something more advanced: How to allow only 2 digits and 1 digit after the comma (.)?

Answer 2

you can use RegExp class

final isValidNumber = RegExp(r'^([0-9]{2})*\.[0-9]{2}$');

if (!isValidNumber .hasMatch(number))
    numbererror = "Please Enter Valid Name";
else
   numbererror = "";