[guest@localhost ~]$ text="\
> bla bla 23.33.72 bla
> bla bla la na 45.34.33 bla en
> bla la na 45.34.33 bla urjt
> "
[guest@localhost ~]$
[guest@localhost ~]$ echo -n "$text"
bla bla 23.33.72 bla
bla bla la na 45.34.33 bla en
bla la na 45.34.33 bla urjt
[guest@localhost ~]$
[guest@localhost ~]$ echo -n "$text" | sed 's/.* \([0-9]*\.[0-9]*\.[0-9]*\) .*/\1 &/'
23.33.72 bla bla 23.33.72 bla
45.34.33 bla bla la na 45.34.33 bla en
45.34.33 bla la na 45.34.33 bla urjt
[guest@localhost ~]$