How to restrict values entered in a TextField in Flutter?

Question

What is the idiomatic way to limit input in a Flutter TextField only to these values which match the regexp ^[0-9]+(\.[0-9]+)$?

Answer 1

Use the property inputFormatters

return TextField(
  inputFormatters: [
    FilteringTextInputFormatter.allow(RegExp(^[0-9]+(\.[0-9]+)$)),
  ],
);

I hope this helps.