$ perl sort_versions.pl
Patch_1.0
Patch_3.1
Patch_4.2
Patch_4.7
Patch_4.8
Patch_4.18
Patch_4.20
Patch_4.22
Patch_5.0
Patch_6.0
Patch_9.3
Patch_10.2
Patch_11.2
Patch_11.4