java – Parse number with regexp

I have a text block as a paragraph that starts from some number as a string. There could be simple numbers or dotted ones. I have the next paragraph numbers:

1) sovereign control will prevail

1.1. These are the Rules

5.47.1 "Пункт зупинки тролейбуса".

I use the next regexp expression to find the number.

([0-9.,\\-\\s]+)\\b")

Now, I got the new number format
source text

 5.24.1 і 5.24.2 "Зміна напрямку руху на дорозі з розділювальною смугою"

I need to get the number 5.24.1_ 5.24.2

How can regex expression be written to use one all scenario?