How can I improve my regex for validating floats?

I'm working on a regex pattern to validate if a string is a float, and I need it to handle cases with digits before and/or after the decimal point while ensuring that at least one digit is present. Currently, I'm using the following regex: `^-?(d+.d*|d*.d+)$`. This matches inputs like `-90.`, `.67`, and `42.6`, but it doesn't match standalone `.` or `-.`. I'm looking for suggestions to refine this regex or alternative methods to achieve robust float validation.