Question

How to allow only a valid floating point number into a text field
floating point like these only
15
15.41
7045.12
0.74

–only 2 places after the digit
–max one dot
–only positive number so no need for +/-

Answer 1

/^\d+(?:\.\d{1,2})?$/

and I bet this has been asked here before…

This regex allows integers or floats with one or two decimal places. The integer part is mandatory.

If your intent is not to validate input strings but to find decimal numbers inside a larger string, use this instead:

/\b\d+(?:\.\d{1,2})?\b/