TextFormField clears input text even if the Regex expression is satisfied

I’m using RegExp for positive decimal numbers

TextFormField(
  keyboardType: TextInputType.numberWithOptions(decimal: true),
  inputFormatters: [
    FilteringTextInputFormatter.allow(RegExp(r'^\s*(?=.*[1-9])\d*(?:\.\d{1,2})?\s*$')),
  ],
)

But when I enter something like 1.x, the TextFormField deletes the entire input. What am I doing wrong?

>Solution :

the issue is that your regular expression don’t give you the ability to have a . without a digit after it. you can copy past x.y but you can’t type it one char at a time.
the solution would be relative to what you want and prioritize, but I think this regex might solve the issue :

r'^\s*(?=.*[1-9])\d?\.*(?:\d{1,2})?\s*$'