How to get float value from string

Question

I have a string like

> 12.4N-m/kg.

From the above string I need to get a value 12.4.

When I use replace all function str.replaceAll("[^.0-9]", "").

This doesn't work when then string has two dots.

The location of float value may differ.

Answer 1

First discard all non flot characters and then covert to Float like this:

float f = Float.valueOf("> 12.4N-m/kg.".replaceAll("[^\\d.]+|\\.(?!\\d)", ""));
// now f = 12.4