A pattern like [.0-9]+ will detect a sequence of digits and dots, also including something like 0.000.0, probably undesirably so. For your examples it would work, full code could be like this:
use strict;
use warnings;
my @f = qw(
/fd/gfree/tere/frf4545/geerg/fds/0.1/fsdf/dsakdsa/
/fd/gfree/tere/frf4545/geerg/dfds/5.9/fdsf/fdsfd/
/fd/gfree/tere/frf4545/geerg/dsad/02.44/fdsf/fdsf/
);
s|(/[.0-9]+)/.*|$1| for @f;
print "$_\n" for @f;
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